Budapest sits on caves that no rainwater made. Warm water rose through the limestone from below and dissolved it from the inside, which is why the walls here carry globular hollows, gypsum crusts and pea-sized calcite nodules you will not see in an ordinary karst cave – and why Budapest's tourist board calls it the only capital in the world with a live thermal cave system under its streets. More than 200 caves are known beneath the city and four can be walked: the Pál-völgyi Cave, at 32 km the longest in Hungary; the Szemlő-hegyi Cave with its pea-stone walls; the Castle Cave under the old town; and the unlit Mátyás-hegyi section, which you do in overalls. Add the Hospital in the Rock – a museum in a built corridor system 15 m under Castle Hill, not a cave – and the Molnár János Cave, still full of 20–28 °C thermal water and open to qualified divers only. This page gives the 2026 prices in forint and US dollars, the two different closing days, and the €4-odd that English speakers pay for nothing.
- TicketsPál-völgyi and Szemlő-hegyi: walk-up visitors buy at the desk, at the latest ten minutes before the tour starts; the national park sells only its special programmes (bat tours, gift vouchers) online.
- Price€30 (about $34.38), charged in forint at the national bank's daily rate – Hospital in the Rock – guided tour in English, adults 18–65
- OpenHospital in the Rock (Sziklakórház): daily 10:00–19:00, ticket office and shop until 18:00, the last tour leaves at 18:00; closed 1 January, 1 November, 24, 25 and 31 December.
- Best timeThe caves ignore the weather and hold the same temperature all year, which makes them the standard wet-day plan and the standard escape from July and August afternoons when it is 35 °C above and 11 °C below.
- ClaustrophobiaThe Labirintus circuit ends in a completely unlit passage that you feel your way along by holding a cord – not a place for anyone claustrophobic.
Nine places under Budapest, compared
Hospital in the Rock Nuclear Bunker Museum (Sziklakórház)
A museum inside a 2,370 m² corridor system 10 to 15 m under Castle Hill: built into existing cellars and cavities from 1939, opened in February 1944 as an emergency surgical hospital, overrun during the siege of Budapest with 650 to 700 wounded in rooms meant for 60 beds, later extended into a nuclear shelter and kept secret until 2002.
A total ban on photography, video and sound recording, museum-wide. Hungary's largest wax figure display fills the operating theatres, wards and the decontamination lock; two diesel generators still run in the machine section. The bunker walls are a metre thick and there is no phone signal. The foundation takes no state money, the site is cashless, and audio guide handsets in nine languages including English are free during the tour. A longer 90-minute tour in Hungarian runs daily at 14:00.
English tour €30 (about $34.38), Hungarian tour 9,500 HUF (about $29.89); children 6–18 €15 or 4,800 HUF (as of 09/2026)
Castle Cave (Vár-barlang, run by the national park)
A cave and cellar system more than 3 km long under the old town, shown by the Duna-Ipoly National Park: dozens of natural chambers and passages, some of them closed to visitors until recently. The theme is how thermal water caves became a maze of cellars – wine store, prison, air raid shelter, at one point even a nightclub.
An easy walk with no climb, few steps, firm floor, lit throughout, 12 °C. The route passes the spot where a mammoth tooth was found. Photography only with the written consent of every participant and the guide. Not accessible, no pushchairs, no dogs. Nine Hungarian-language departures were listed for the six weeks from 21 September 2026 – this is not a place you can drop into.
Full tour 5,400 HUF (about $16.99), short tour 3,900 HUF (about $12.27), extra tour 6,500 HUF (about $20.45); in English 7,500 and 6,200 HUF (as of 09/2026)
Labirintus (Úri utca 9)
A privately run circuit through medieval cellars and natural cavities under the old town, with plaster casts of Hungarian kings, Gothic and Ottoman stonework and a photo exhibition about caves around the world. The high point is a completely dark passage you cross by holding on to a cord.
16–18 °C at 90 % humidity, street clothes are enough. You walk it alone and arrows show the way. The operator markets the place as where Vlad Țepeș was held – there is no evidence for that. The site was closed after an official intervention in 2011 and changed hands afterwards, so check labirintus.eu on the morning of your visit. This is the one place under Castle Hill you can genuinely do on your own.
Adults 2,500 HUF (about $7.86), reduced 2,000 HUF, children under 12 600 HUF, family 5,000 HUF; guided visit by arrangement 5,500 HUF (as of 09/2026)
Pál-völgyi Cave (Pál-völgyi-barlang)
Together with the Mátyás-hegyi section and the Hideg-lyuk–Harcsaszájú cave it runs to about 32 km – the longest cave in Hungary, longer than Baradla at Aggtelek. Some 500 m are built for visitors: tall fissure passages, globular thermal-water hollows, dripstone, calcite crystals and fossil shell imprints.
Over 400 steps and a 7 m ladder with a handrail, which is why the minimum is age 5 and 115 cm. A steady 11 °C. The visitor centre in the old quarry warden's house, open since 2022, has an interactive display on geology and bats. The cave was found in a quarry in 1904 and has taken visitors, on and off, since 1919. The ranger guides in Hungarian; English speakers use the park's free app, which has to be downloaded before you arrive.
Basic ticket 3,900 HUF (about $12.27), reduced 2,800 HUF; combined ticket with Szemlő-hegy 5,900 HUF (as of 09/2026)
Szemlő-hegyi Cave (Szemlő-hegyi-barlang)
A 2,230 m thermal-water cave whose walls are coated in pea-sized calcite nodules and gypsum crusts – hence its Hungarian nickname, the flower garden under the ground. Some 250 m are built out with concrete, steps and electric light, and a shaft nearly 50 m deep opens up beside the path.
The only cave in Budapest you can do in a wheelchair or with a pushchair – ramp, stair lift, accessible toilet, tactile strips and audio boards; inside, some ramps reach 15 degrees, so a companion is strongly advised. A steady 12 °C at close to 100 % humidity with dust-free air; the cave was declared a therapeutic cave in 1991 and respiratory therapy is offered in the Giant Passage. There are no bats, because there is no natural entrance. Children get their own storytelling tour, and there is a playground and geology trail in the park above.
Basic tour 3,900 HUF (about $12.27), reduced 2,800 HUF; combined ticket with Pál-völgy 5,900 HUF (as of 09/2026)
Mátyás-hegyi Cave – caving trips in overalls
The undeveloped part of the same cave system: no paths, no lights, no handrails. You crawl, climb and wriggle through in overalls, helmet and headlamp. No experience is needed, a willingness to get dirty is.
Overalls, helmet and lamp are in the price, as are the cave entry and the guide. The lower limit is school age, the extreme trip starts at 14. There are also school programmes (underground geography lessons) and birthday treasure hunts for children.
Basic trip 14,700 HUF (about $46.25), under-14s 9,000 HUF; extreme trip or team-building 19,900 HUF (about $62.60) (as of 09/2026)
Molnár János Cave (divers only)
A cave entirely filled with thermal water at the foot of Rózsadomb, right beside the Lukács Baths: about 5.5 km of surveyed passage down to 100 m, with a chamber roughly 86 by 27 by 15 m. The same water feeds the baths' medicinal springs.
The water stays 20 to 28 °C all year and stratifies: warm thermal water above, cooler karst water from the Buda hills below. The underwater lake was only found in 2008. This is the one place in Budapest where you can still see the thermal process that made the caves – but only in a wetsuit.
no visitor admission – dives go through the licensed dive centre, price list on request
Cave Church on Gellért Hill (Sziklatemplom)
A Pauline church and monastery in a natural cave above the Danube, consecrated in 1926 and shaped after Lourdes. Banned in 1951, walled up behind two metres of concrete in the 1960s and reopened only in 1989/90.
The ticket includes an audio guide handset in eight languages including English and two short films at the start. Inside are the Lourdes Madonna, wood carvings by a Transylvanian-Californian sculptor and a small collection of Russian metal icons. At about 20 °C it is noticeably warmer than the show caves.
Adults 1,400 HUF (about $4.40), pensioners and students 1,200 HUF, groups of 20+ 1,000 HUF; under-10s free (as of 09/2026)
Kőbánya cellars (Kőbányai pincerendszer)
A former limestone quarry under District X on the Pest side: 32 to 33 km of passages across some 180,000 m², 4 to 10 m wide and high, mostly 10 to 15 m down and in places 30. When quarrying stopped the Dreher brewing family used it as a beer cellar; aircraft engines were built here in 1944, and later mushrooms were grown in it.
A constant 8 to 10 °C with damp air and a wet floor – warm clothes and closed shoes are not optional. Quarrying here is first recorded in a charter of Béla IV in 1244; the first brewery went up from 1844 and Antal Dreher took it over in 1862. Today about 147,000 m² belong to the district and about 33,000 m² to the brewery.
free on opening days, registration advised
Tickets and prices
Pál-völgyi and Szemlő-hegyi: walk-up visitors buy at the desk, at the latest ten minutes before the tour starts; the national park sells only its special programmes (bat tours, gift vouchers) online. Castle Cave: individuals can book online and nowhere else, groups of 15 or more by email; arrive late and you are not let in and not refunded. Hospital in the Rock: capacity is limited and the foundation asks you to buy online, with the booking page showing remaining seats per tour and per language; groups above 14 must register. Labirintus: no advance sale, you walk in and set off. Mátyás-hegyi caving trips: advance booking with Barlangászat.hu only.
Official prices
- Hospital in the Rock – guided tour in English, adults 18–65€30 (about $34.38), charged in forint at the national bank's daily rate
- Hospital in the Rock – guided tour in Hungarian, adults 18–65 (the free English audio guide covers you)9,500 HUF (about $29.89)
- Hospital in the Rock – over-65s and students 19–26 with an ISIC card€22 (about $25.21) in English, 7,000 HUF (about $22.02) in Hungarian
- Hospital in the Rock – children and teenagers 6–18€15 (about $17.19) in English, 4,800 HUF (about $15.10) in Hungarian
- Hospital in the Rock – EU citizens aged 70+ and disabled visitors with one companionfree in all but name (the till charges 1.27 HUF)
- Pál-völgyi Cave – basic ticket (tour and exhibition), full / reduced3,900 HUF / 2,800 HUF (about $12.27 / $8.81)
- Szemlő-hegyi Cave – basic tour of about 40 minutes, full / reduced3,900 HUF / 2,800 HUF (about $12.27 / $8.81)
- Combined ticket for both show caves, valid one year, full / reduced5,900 HUF / 4,700 HUF (about $18.56 / $14.79)
- Pál-völgyi or Szemlő-hegyi – specialist 90-minute tour, groups of 10 or more by arrangement6,400 HUF / 5,200 HUF (about $20.13 / $16.36)
- Pál-völgyi – bat tour with a talk, 2.5–3 hours, booked online5,200 HUF / 4,200 HUF (about $16.36 / $13.21)
- Castle Cave – full 1.5-hour tour in Hungarian, full / reduced5,400 HUF / 4,000 HUF (about $16.99 / $12.58)
- Castle Cave – short 35–40 minute walk-through in Hungarian, full / reduced3,900 HUF / 2,900 HUF (about $12.27 / $9.12)
- Castle Cave – tours in English, full 1.5 hours / short walk-through7,500 HUF / 6,200 HUF (about $23.59 / $19.50); reduced 6,500 HUF / 5,200 HUF
- Castle Cave – extra tour of 2.5–3 hours, full / reduced6,500 HUF / 5,300 HUF (about $20.45 / $16.67)
- Labirintus (Úri utca 9) – adults2,500 HUF (about $7.86)
- Labirintus – students, pensioners and teachers / children under 122,000 HUF / 600 HUF (about $6.29 / $1.89)
- Labirintus – family (2 adults, 2 children under 12) / guided visit by arrangement5,000 HUF / 5,500 HUF (about $15.73 / $17.30)
- Mátyás-hegyi Cave – caving trip in overalls, adults / under-14s14,700 HUF / 9,000 HUF (about $46.25 / $28.31)
- Mátyás-hegyi Cave – extreme trip or team-building, 3–3.5 hours19,900 HUF (about $62.60)
- Cave Church on Gellért Hill – adults / pensioners and students / groups of 20+; under-10s free1,400 HUF / 1,200 HUF / 1,000 HUF (about $4.40 / $3.78 / $3.15)
- Kőbánya cellars on European Heritage Daysfree, registration advised
As of 09/2026 · source and direct booking: sziklakorhaz.eu/en
When everything is sold out
The bottleneck is group size, not demand: Pál-völgyi takes 35 people per tour, the Castle Cave and the Hospital in the Rock 25 each. If a cave tour is full you get the next hour. The real constraint is the Castle Cave, which has no timetable – nine departures were listed for the six weeks from 21 September 2026, all of them in Hungarian.
Tours and tickets for underground Budapest
A reseller saves you nothing at the two show caves: the national park sells at the desk only, for 3,900 HUF (about $12.27), and if a tour is full you take the next hour. It earns its keep where the operator does not sell to you in English – the park itself routes its English Castle Cave departures through GetYourGuide – and at the Hospital in the Rock, where capacity is limited and tours sell out. Two things to check in any listing: whether admission is actually included rather than just the guiding, and which hole in Castle Hill you are being sold. Úri utca 9 is the private Labirintus, which you walk alone for 2,500 HUF (about $7.86); Dárda utca 2 is the national park's Castle Cave, ranger-led and only on announced dates.
Budapest: Buda Castle Cave Tour
Budapest: Adventure Caving Tour with Guide
Budapest: Szemlő-hegyi & Pál-völgyi Caves Guided Walking Tour
Under Budapest: Adventure in the glass labyrinth of the Pálvölgyi Cave
Booked through GetYourGuide (affiliate link, advertising). Most offers can be cancelled free of charge up to 24 hours ahead. Prices as of 20 September 2026.
Opening hours and best time
Hospital in the Rock (Sziklakórház): daily 10:00–19:00, ticket office and shop until 18:00, the last tour leaves at 18:00; closed 1 January, 1 November, 24, 25 and 31 December. Pál-völgyi Cave: every day except Mondays, tours on the hour at quarter past, first at 10:15, last at 16:15; buy the ticket at least ten minutes before the tour; closed 24–26 and 31 December and 1 January. Szemlő-hegyi Cave: every day except Tuesdays, tours hourly 10:00–16:00, same holiday closures. Note the trap: the two caves close on different days. Monday is a Szemlő-hegyi day, Tuesday a Pál-völgyi day. Castle Cave (Vár-barlang): no regular service at all – only single announced departures, nine of them listed for the six weeks from late September 2026, usually a weekend morning or afternoon; dates and tickets online only. Labirintus (Úri utca 9): daily 11:00–18:00, and the operator states in writing that the times are indicative and can change without notice. Cave Church on Gellért Hill: Monday to Saturday 9:30–19:30, closed to visitors on Sundays; no visiting during the 17:00 mass. Mátyás-hegyi caving trips: all year, by advance booking only. Kőbánya cellars: no regular visiting at all, open on a handful of days a year (the Szent László days in June, European Heritage Days in September, the occasional festival).
When it is quietest
The caves ignore the weather and hold the same temperature all year, which makes them the standard wet-day plan and the standard escape from July and August afternoons when it is 35 °C above and 11 °C below. What matters is the day of the week: Pál-völgyi closes on Mondays, Szemlő-hegyi on Tuesdays, so anyone who wants both needs a day between Wednesday and Sunday. The Castle Cave decides your itinerary rather than the other way round – check its dates before you fix the Castle Hill day. The first Pál-völgyi tour at 10:15 is usually near-empty; afternoons fill. The Hospital in the Rock is quieter in the morning, and its 18:00 departure is a good fallback for the hour when the Castle Hill museums shut.
Who it suits
With children
Pál-völgyi Cave: from age 5 and 115 cm only, because of the 400-plus steps and a 7 m ladder. Szemlő-hegyi Cave: no age limit, the built path takes a pushchair, and there is a children's storytelling tour and a playground in the park above. Castle Cave: the short walk-through is recommended from age 5, the full tour from 12. Hospital in the Rock: under-6s are not admitted at all and under-12s are not recommended (the wax figures show war wounds), 6- to 12-year-olds only with an adult. Caving trips: from school age, the extreme trip from 14.
Minimum age
Hospital in the Rock from 6 (a rule, not a suggestion), Pál-völgyi from 5 and 115 cm, the short Castle Cave tour from 5, the extreme Mátyás-hegyi trip from 14. Diving in the Molnár János Cave needs at least an Advanced Open Water certificate plus experience.
Wheelchair
Only the Szemlő-hegyi Cave is built for it: ramp with an intercom, stair lift, accessible toilet, tactile guide strips and audio boards for blind and partially sighted visitors. Inside, some ramps reach 15 degrees, so the park strongly advises bringing someone with you. Pál-völgyi is unsuitable and the park says so itself, pointing people to Szemlő-hegy. At the Hospital in the Rock the hospital section is accessible but the machine section is not – steps, narrow doors and zigzag corridors – so about a quarter of the exhibition drops away. The Castle Cave is level but not accessible.
Pushchair
Szemlő-hegyi yes, Pál-völgyi no, Castle Cave no (pushchairs are expressly excluded), Labirintus no (steps, uneven wet floor).
Dogs
Banned outright in all four national park caves, the accessible Szemlő-hegyi Cave and the Castle Cave included.
Claustrophobia
The Labirintus circuit ends in a completely unlit passage that you feel your way along by holding a cord – not a place for anyone claustrophobic. The Hospital in the Rock lies behind metre-thick concrete with no phone signal. The Mátyás-hegyi caving trips go through squeezes you take on your stomach. Harmless by comparison: Szemlő-hegy, with a wide lit walkway, and the Castle Cave, level and lit throughout.
What to wear
Pál-völgyi 11 °C, Szemlő-hegyi and the Castle Cave 12 °C – a jacket and closed shoes even in August, and the park recommends walking boots. Street clothes are fine in the Labirintus (16–18 °C, but 90 % humidity) and at the Hospital in the Rock (15–18 °C). The Kőbánya cellars run 8–12 °C on a wet floor. For the caving trips the operator supplies overalls, helmet and headlamp; wear something underneath that can get filthy.
Photography
At the Hospital in the Rock photography, filming and audio recording are banned throughout and no photo permit is sold – the strictest rule in the city and the commonest argument at the door. In the Castle Cave you may photograph only if every participant and the guide agree in writing, which in practice means no. In the two show caves and the Labirintus private pictures are normal.
Getting there
By public transport
From the airport: bus 100E, the Airport Express, runs round the clock from Terminal 2 to Deák Ferenc tér via Kálvin tér in about 40 minutes, every 6 to 10 minutes by day. It needs its own 2,500 HUF (about $7.86) airport shuttle ticket – ordinary Budapest passes and the plain Budapest Card are not valid on it, though holders of a Budapest travel pass can buy a 1,000 HUF add-on. Castle Hill (Hospital in the Rock, Castle Cave, Labirintus): bus 16 from Deák Ferenc tér, or 16A and 116 from Széll Kálmán tér (metro M2); the Sikló funicular climbs from the Chain Bridge. Pál-völgyi Cave: bus 65 from Kolosy tér to the Pál-völgyi-cseppkőbarlang stop, with the ticket desk in the visitor centre opposite the cave mouth. Szemlő-hegyi Cave: bus 29 from Szentlélek tér (metro M3 at Árpád híd is a short walk) to the cave, then 100 m downhill to the reception building. Cave Church: metro M4 to Szent Gellért tér, at the foot of Gellért Hill beside the Gellért Baths. Molnár János Cave: Frankel Leó utca 48, next to the Lukács Baths. Kőbánya cellars: Bánya utca 37 in District X, only on opening days.
By car
Driving in the Castle District is pointless and expensive; the Labirintus operator names Lovas út, a one-way street off Palota út, as the nearest option. The Pál-völgyi Cave has a former quarry with green space and room to pull in; Szemlő-hegy has street parking in the villa quarter.
From the nearest city
Everything is inside the city. From Castle Hill to the two show caves in Rózsadomb is about 5 km; Pál-völgyi and Szemlő-hegyi are only about 1.2 km apart and can be linked on foot or in a few minutes by bus, which is what the combined ticket is for. The Kőbánya cellars are the only site on the Pest side, roughly 8 km from Castle Hill.
Tips for your visit
- Learn the two closing days. Pál-völgyi shuts on Mondays, Szemlő-hegyi on Tuesdays, so seeing both needs a day between Wednesday and Sunday – and the combined ticket at 5,900 HUF, about $18.56, stays valid for a year.
- At the Hospital in the Rock, book the Hungarian tour. It costs 9,500 HUF, about $29.89, against €30, about $34.38, for the English one, and the English audio guide handset is free during any guided tour. You save roughly $4.50 a head for the same hour underground.
- Download the national park's audio guide app at the hotel. It is free and includes English, the ranger guides in Hungarian, and there is no phone signal in the cave – so an app downloaded at the entrance is an app that does not work.
- Put the camera away at the Hospital in the Rock before you go in. Photography, filming and sound recording are banned throughout, no photo permit is sold, and the rule is enforced.
- Check the Castle Cave dates first, then plan the Castle Hill day around them. There is no timetable, individuals can only book online, and anyone late to the meeting point at the Holy Trinity column loses both the place and the money.
- Pack a jacket even in August: 11 °C at Pál-völgyi, 12 °C at Szemlő-hegy and in the Castle Cave. Proper shoes are essential at Pál-völgyi because of the 400-plus steps and the 7 m ladder.
- With small children, a pushchair or a wheelchair, go straight to Szemlő-hegy. Pál-völgyi turns away anyone under 5 or under 115 cm and sends them to its neighbour.
- Carry forint notes in the Castle District. The Hospital in the Rock takes cards at the machines only, and English travel writers consistently report the Labirintus as cash-only.
- The cheapest and warmest underground half-hour in the city is the Cave Church at 1,400 HUF, about $4.40 – but it is closed to visitors on Sundays and stops for the 17:00 mass.
- Do not buy the Budapest Card for the underground. It gives 10 % off one site, the Hospital in the Rock, free entry to the small Millennium Underground Railway Museum, and nothing at the caves; and it is not valid on the 100E airport bus, which needs its own 2,500 HUF ticket.
What the internet gets wrong
Vlad Țepeș was Matthias Corvinus's prisoner from 1462, and the places recorded are Visegrád and the twin town of Buda-Pest. No source places him in the cavities under Castle Hill. The chamber is a set with a fog machine, as the English guide Hungary Unlocked points out.
Both show caves charge 3,900 HUF, about $12.27, and the combined ticket is 5,900 HUF. The lantern tours belonged to the labyrinth operator that the environmental authority evicted in 2011; nothing of that kind has existed under Castle Hill for fifteen years.
These are two different businesses in the same hill. The private Labirintus at Úri utca 9 charges 2,500 HUF, about $7.86, and has no guide at all. The English tours belong to the national park's Castle Cave at Dárda utca 2 and cost 6,200 HUF for the short walk-through and 7,500 HUF for the full 1.5 hours. Booking one and turning up at the other is the single most common mistake English-speaking visitors make here.
The Castle Cave has no regular service whatsoever. It runs single announced departures – nine of them, all in Hungarian, listed for the six weeks from 21 September 2026 – and individuals can book online only. The private Labirintus does open daily, but 11:00 to 18:00, and says in writing that even those hours can change without notice.
There is no self-guided option in any of the four national park caves. Szemlő-hegy, Pál-völgy, the Castle Cave and the Mátyás-hegyi section are all guided only, with fixed departure times and a maximum group size. The one place under Budapest you genuinely walk alone is the private Labirintus, where you follow arrows.
The foundation's own wording is "It is not allowed to make photos, videos or audio recordings. We do not sell photo tickets." The ban covers the whole museum, and the adult tour is €30 in English or 9,500 HUF in Hungarian, not €18.
The museum is not a cave. It is a 2,370 m² system of masonry and concrete corridors driven into existing cellars from 1939, and the bunker section has walls a metre thick. The natural cave system under the Castle District is given by the national park as more than 3 km, and by the Hungarian Wikipedia as 3.3 km – not ten.
Pál-völgyi closes on Mondays only. Tours leave at quarter past each hour, first at 10:15 and last at 16:15, and the guided visit takes about one hour along 500 m of built path. The cave that shuts on Tuesdays is Szemlő-hegy, 1.2 km away, and confusing the two is how people lose a morning.
History in brief
- The caves under Buda were not made by rainwater sinking through the rock. Warm water rose from below and dissolved the limestone from the inside, which is why they show globular hollows, gypsum crusts and pea-stone nodules that ordinary karst caves do not have.
- A charter of King Béla IV records quarrying at Kőbánya in 1244; the Sarmatian limestone from that quarry later went into the big buildings of Pest.
- From the Middle Ages the residents of the Castle District joined the natural cavities under their houses into cellars and passages, used as wine stores, larders, prisons and refuges.
- In 1904 quarry workers on Szépvölgyi út broke into the Pál-völgyi Cave; a few hundred metres were opened up soon after, and it has taken visitors on and off since 1919.
- In 1930 quarrying opened the Szemlő-hegyi Cave; it was given special protected status in 1982 and formally declared a therapeutic cave in 1991.
- From 1939 the city built an emergency surgical hospital into the existing passages and cellars under Castle Hill. It opened in February 1944, and during the siege of Budapest in 1944–45 rooms designed for 60 beds held 650 to 700 wounded.
- In 1944 the Weiss Manfréd works moved part of its aircraft engine production into the Kőbánya cellars to escape the bombing; engines for the Luftwaffe were built there while the same passages served as an air raid shelter.
- Between 1958 and 1962 the hospital was extended into a nuclear shelter under the cover name LOSK 0101/1, with air and water treatment, two diesel generators and its own pipeline from the Danube. It stayed secret until 2002 and opened as a museum in 2008.
- In 2008 divers found a previously unknown underwater lake in the Molnár János Cave; about 5.5 km have now been surveyed, with the deepest points at 100 m.
- In 2011 the environmental authority removed the then operator of the labyrinth in the Castle District with police assistance, alleging damage to a protected natural monument. The business changed hands afterwards: today the national park runs the Castle Cave, while a private Labirintus operates at Úri utca 9. Almost every English article about the labyrinth still describes the pre-2011 attraction.
Frequent questions
Is underground Budapest worth it?
For a three-day trip, yes – but not all of it. The Hospital in the Rock is the one that stays with you, Pál-völgyi is the only real dripstone cave, and the two together cost less than an evening in a ruin bar. The Labirintus is entertainment rather than information, and the Cave Church at 1,400 HUF, about $4.40, is something you pick up in half an hour on your way to the Gellért Baths.
What is the difference between the Labyrinth and the Castle Cave in Budapest?
They are two separate businesses inside the same hill, and English listings mix them up constantly. The Labirintus at Úri utca 9 is private, open daily 11:00–18:00, costs 2,500 HUF, about $7.86, and is an exhibition of royal busts and a dark passage that you walk alone. The Castle Cave at Dárda utca 2 belongs to the Duna-Ipoly National Park: ranger-led only, on a handful of announced dates, with the geology and history explained. Want a cave, book the Castle Cave; want half an hour of fun on the spot, take the Labirintus.
How much is the Hospital in the Rock, and why are there two prices?
The English-language tour is €30, about $34.38, and the Hungarian-language one is 9,500 HUF, about $29.89. The tour, the route and the hour are identical; only the guide's language differs. Because audio guide handsets in nine languages, English included, are free during any guided tour, English speakers who book the Hungarian departure save roughly $4.50 a head. Children 6–18 pay €15 or 4,800 HUF, over-65s and ISIC students €22 or 7,000 HUF. Budapest Card holders get 10 % off, and the site is cashless.
Can you visit the caves in Budapest without a tour?
Not the real ones. All four national park caves – Pál-völgyi, Szemlő-hegyi, the Castle Cave and the Mátyás-hegyi section – are guided only, with fixed departures and a capped group size. The only walk-in, walk-alone site under Castle Hill is the private Labirintus, and the Cave Church on Gellért Hill is self-guided with an audio guide. Anything online promising a self-guided visit to Szemlőhegyi is wrong.
Which cave should I choose, Pál-völgyi or Szemlő-hegyi?
Pál-völgyi is the sporting one: an hour, over 400 steps, a 7 m ladder, dripstone and tall fissure passages, minimum age 5 and 115 cm. Szemlő-hegyi takes 40 minutes, is built for wheelchairs and pushchairs, and shows pea-stone nodules and gypsum crusts rather than dripstone. Both cost 3,900 HUF, about $12.27; the combined ticket is 5,900 HUF, about $18.56, and stays valid for a year.
Are the Budapest caves open every day?
No, and the closing days differ on purpose-defeating lines. Pál-völgyi closes on Mondays, Szemlő-hegyi on Tuesdays, so a Monday visitor goes to Szemlő-hegy and a Tuesday visitor to Pál-völgy. The Castle Cave has no timetable at all, only announced dates. The Labirintus is open daily 11:00–18:00 and the Cave Church Monday to Saturday, closed to visitors on Sundays.
How many steps are in the Pál-völgyi Cave?
More than 400, plus a 7-metre ladder with a handrail. That is why the national park sets a minimum of age 5 and 115 cm in height and turns away pushchairs. If that sounds like too much, Szemlő-hegyi Cave 1.2 km away has a concrete walkway, a stair lift and an accessible toilet, and the park itself points people there.
Are the tours in English?
At two sites, live. The Hospital in the Rock runs English tours all day alongside the Hungarian ones, and the Castle Cave sells separate English departures at 6,200 and 7,500 HUF. At Pál-völgyi and Szemlő-hegyi the ranger speaks Hungarian and you follow on the national park's free audio guide app, which includes English – download it before you arrive, because there is no signal underground. The Cave Church hands out an English audio guide with the ticket.
Do I need to book Budapest's underground sites in advance?
For Pál-völgyi and Szemlő-hegyi, no: buy at the desk up to ten minutes before a tour, and if it is full you take the next hour. The Castle Cave must be booked online, because it has no regular service. The Hospital in the Rock asks you to buy online, as capacity is limited and the booking page shows seats per language. The Labirintus needs nothing, and the caving trips need a reservation with Barlangászat.hu.
Can you take photos at the Hospital in the Rock?
No. Photography, filming and audio recording are banned across the whole museum, and no photo permit is sold at any price – the operator's own wording is unambiguous. In the Castle Cave you may photograph only if every participant and the guide give written consent, which in practice means you do not. The show caves and the Labirintus are relaxed about private pictures.
How long does the Hospital in the Rock take?
Sixty minutes on the standard tour, in a group of no more than 25. A longer 90-minute version runs daily at 14:00 in Hungarian. The ticket office closes at 18:00 and the last tour leaves at 18:00, which makes early evening a good slot – the museums above ground on Castle Hill are shutting by then.
How do I get from Budapest airport to the underground sites?
Bus 100E, the Airport Express, runs round the clock from Terminal 2 to Deák Ferenc tér in about 40 minutes for a dedicated 2,500 HUF ticket, about $7.86 – ordinary passes and the plain Budapest Card do not cover it. From Deák Ferenc tér, bus 16 climbs Castle Hill for the Hospital in the Rock, the Castle Cave and the Labirintus. For the two show caves, take bus 65 from Kolosy tér to Pál-völgy or bus 29 from Szentlélek tér to Szemlő-hegy. The Cave Church is on metro M4 at Szent Gellért tér.
Is the Budapest Card worth it for the underground?
Not on its own. It gives 10 % off at the Hospital in the Rock and free entry to the Millennium Underground Railway Museum, and the caves are not on the discount list – the Pál-völgyi Cave calls itself an acceptance point but publishes no terms. The 24-hour card is 17,990 HUF, about $56.60, so it earns its keep through transport and the big museums, not down here. It is also not valid on the 100E airport bus.
Can you visit the Molnár János Cave?
Only by diving it. The cave is completely filled with thermal water at 20 to 28 °C, there is no walkable section and no visitor programme. Dives go through the single licensed centre on Frankel Leó utca and need at least an Advanced Open Water certificate, real experience and a booking made well in advance.
Is there a caving trip in Budapest where you crawl?
Yes, in the undeveloped Mátyás-hegyi section of the same cave system. The basic trip is about three hours and costs 14,700 HUF, about $46.25, for adults and 9,000 HUF for under-14s; the extreme and team-building trips are 19,900 HUF, about $62.60. Overalls, helmet, headlamp, entry and guide are included and no experience is required. Booking is compulsory and the extreme trip starts at 14.
Sources
Show 40 sources – every figure on this page is sourced
- www.sziklakorhaz.eu/en/information – Hospital in the Rock: opening 10:00–19:00, last tour 18:00, closing days, photography ban in the operator's own wording, age limits 6/12, maximum 25 people, cashless, 60 minutes, audio guide in nine languages
- www.sziklakorhaz.eu/en/prices – Prices: English programme €30/22/15, Hungarian programme 9,500/7,000/4,800 HUF, 10 % group discount, free entry for EU over-70s and disabled visitors with a companion
- www.sziklakorhaz.eu/en/ – "Audio guide tools are available for free during the guided tours in 9 languages" including English; address Lovas út 4/c
- www.sziklakorhaz.eu/en/faq – 15–18 °C, 15 m depth, metre-thick concrete, no phone signal, wheelchair access to the hospital section only, guiding in Hungarian and English, audio guide languages named on this page
- www.sziklakorhaz.eu/en/online-tickets – Booking rules, limited capacity, separate English and Hungarian departures with seats shown per language, ID required for reduced tickets
- www.sziklakorhaz.eu/hu – 90-minute Hungarian tour daily from 14:00, awards, one million visitors 2007–2019
- hu.wikipedia.org/wiki/Sziklak%C3%B3rh%C3%A1z_Atombunker_M%C3%BAzeum – 2,370 m², corridor system 10–15 m deep, built 1939–1944, 60 beds, 650–700 wounded in 1944/45, LOSK 0101/1, extension 1958–1962, secret until 2002, museum from 2008, 3.3 km cave and cellar system
- www.dunaipoly.hu/hu/helyek/bemutatohelyek/pal-volgyi-barlang – Pál-völgyi: 32 km system, 500 m visitor path, over 400 steps, 7 m ladder, from age 5 and 115 cm, 11 °C, tours 10:15–16:15, closed Mondays, prices including the combined and HungaryCard rates, maximum 35, free audio guide app in eight languages including English, discovery 1904, visitor centre 2022, Budapest Card acceptance point, payment methods
- www.dunaipoly.hu/hu/helyek/bemutatohelyek/szemlo-hegyi-barlang – Szemlő-hegyi: 12 °C, 40 minutes, closed Tuesdays, tours 10:00–16:00, prices including combined ticket valid one year and HungaryCard, wheelchair and pushchair access, no dogs, audio guide app languages, bus 29
- www.dunaipoly.hu/hu/helyek/bemutatohelyek/budai-var-barlang – Castle Cave: system over 3 km, 12 °C, tour lengths 40/90/150–180 min, prices for Hungarian and English tours including reduced rates, maximum 25, age recommendations, photography rule, meeting points, online booking only for individuals, no pushchairs, no dogs
- www.jegy.hu/program/var-barlangi-seta-149922 – Castle Cave: the actual departures listed from 21 September 2026 (nine dates), 1.5-hour duration, meeting point, Hungarian as the tour language
- www.dunaipoly.hu/hu/helyek/bemutatohelyek/matyas-hegyi-barlang – Mátyás-hegyi: caving trips with no built path, overalls, helmet and lamp supplied, prices 14,700/9,000/19,900 HUF, age limits, booking through barlangaszat.hu
- barlangaszat.hu/arak/ – Caving trip prices, what is included, school groups, SZÉP card
- labirintus.eu/informacio/ – Labirintus: price list (2,500/2,000/600/5,000/5,500 HUF), 11:00–18:00 daily with hours described as indicative, 16–18 °C, 90 % humidity, about 30 minutes, no guide, parking, and the operator's own Vlad Țepeș claim
- labirintus.eu/en/informacio/ – English visitor information with no prices, "opening hours are informative, the times are subject to change without notice", arrows instead of a guide
- index.hu/belfold/2011/07/29/visszavette_az_allam_a_budavari_lab… – Eviction of the labyrinth operator on 29 July 2011 by the environmental authority with police assistance, alleged damage to a protected natural monument, handover to the national park
- sziklatemplom.hu/latnivalok/ – Cave Church: prices 1,400/1,200/1,000 HUF, under-10s free, audio guide in eight languages including English, Pauline reception centre
- www.sziklatemplom.hu/ – Cave Church: Monday to Saturday 9:30–19:30, closed Sundays, no visiting during the 17:00 mass, address
- welovebudapest.com/hely/gellert-hegyi-sziklatemplom/ – Interior temperature of about 20 °C
- hu.wikipedia.org/wiki/Szeml%C5%91-hegyi-barlang – Szemlő-hegyi: 2,230 m total length, 250 m visitor path, discovery 1930, protection 1982, therapeutic cave 1991, pea-stones and gypsum crusts, no bats, visitor numbers 2012–2014
- en.wikipedia.org/wiki/Moln%C3%A1r_J%C3%A1nos_Cave – Molnár János: 5.5 km surveyed, down to 100 m, largest chamber about 86 × 27 × 15 m, underwater lake found 2008
- mjcave.hu/en/diving/ – Diving requirements (Advanced Open Water minimum plus experience), the single licensed dive centre, water 20–28 °C, advance booking
- hu.wikipedia.org/wiki/K%C5%91b%C3%A1nyai_pincerendszer – Kőbánya: 32–33 km, 180,000 m², 4–10 m wide and high, 10–15 m deep (max 30 m), charter of 1244, brewery 1844, Dreher 1862, aircraft engines in the Second World War, ownership split
- oroksegnapok.gov.hu/seta/1707 – Kőbánya cellars: 8–10 °C, damp air, wet floors, meeting point Bánya utca 37; European Heritage Days 2026 on 19 and 20 September
- bkk.hu/en/tickets-and-passes/budapest-card/places-of-acceptance… – Budapest Card: 10 % discount at the Hospital in the Rock, free entry to the Underground Railway Museum, and no listing for any of the caves
- bkk.hu/en/tickets-and-passes/budapest-card/ – Budapest Card prices 17,990 / 23,990 / 29,990 / 38,990 HUF, what is included, airport transfer only in the Plus and Flexi versions
- bkk.hu/en/travel-information/airport-express/ – Bus 100E: route to Deák Ferenc tér via Kálvin tér, about 40 minutes, frequency, 2,500 HUF dedicated ticket, ordinary Budapest passes not valid, 1,000 HUF add-on for pass holders
- www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml – ECB reference rates of 18 September 2026: 1 EUR = 1.1460 USD and 1 EUR = 364.28 HUF, giving 1 USD = 317.87 HUF – the basis of every dollar figure on this page
- justbudapest.com/labyrinth-of-buda-castle/ – English errors: "Vlad was imprisoned in the labyrinth's underground caves", "general admission is priced at HUF 5,000", and the national park's English cave tours listed as if they were the Labirintus
- www.corinthia.com/en-gb/budapest/discover-budapest/exploring-th… – English error: "Dracula's Chamber, where King Matthias was imprisoned in the 15th century"
- www.budapestbylocals.com/caving-in-budapest/ – English errors: Pálvölgyi 1,200 HUF and 10.00–16.00, Szemlőhegyi 1,000 HUF, "Castle Cave/Labyrinth" 2,000 HUF open 10.00–19.00 daily with lantern tours after 18.00, on a page dated 4 July 2026
- alle.travel/en/budapest/pages/budapest-caves-explore-the-city-s… – English errors: "self-guided tours... available at some caves, like Szemlőhegyi", Buda Castle Labyrinth "Daily: 10:00 AM – 7:00 PM" at 3,000 HUF
- budacastlebudapest.com/labyrinth-under-the-castle-hill/ – English error: the national park's Castle Cave sold as "typically Monday to Sunday", under the heading "Labyrinth under the Castle Hill"
- airial.travel/attractions/hungary/budapest/hospital-in-the-rock… – English error: "Photography is allowed inside the Hospital in the Rock Museum" and "approximately €18 for adults"
- www.mentalfloss.com/article/86987/budapests-former-top-secret-h… – English error: the Hospital in the Rock as "a series of ancient, naturally formed caves" with a cave system "over six miles long"
- hungaryunlocked.com/budapest-hospital-in-the-rock-insider-guide/ – English guide confirming €30 and 9,500 HUF and the photography ban, while describing the museum as "built into the caves under Buda Castle"
- hungaryunlocked.com/labyrinth-of-buda-castle/ – Assessment of the Dracula staging (documented imprisonment at Visegrád), the dark passage, and the cash-only note
- www.budapest.com/en/locations/palvolgyi-cave – English error: Pálvölgyi listed as closed on Mondays and Tuesdays, 10:00–16:00
- www.triphobo.com/places/budapest-hungary/palvolgyi-cave – English error: "it may take more than 3 hours to explore the nooks and corners of this cave"
- www.budapestinfo.hu/en/the-caves-of-budapest-open-to-the-public – Budapest's official tourism office on the caves open to the public and the city's description as the only capital with a thermal cave system beneath it