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6 of 6 places
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Kaiserthermen Trier – Bedienungsgänge
Catacomb Trier · Moselle · Rhineland-Palatinate
The thermal baths were never completed, but their basement is exceptionally well preserved: a network of service corridors and drainage channels beneath the bathing complex that visitors can walk through. A World Heritage Site since 1986.
- Adults
- €6.00
Open daily all year round; April to September 9 am–6 pm, shorter opening hours in winter; last admission 30 minutes before closing time. Closed on Rose Monday, Christmas Day, New Year’s Eve and New Year’s Day. zentrum-der-antike.de/monumente/kaiserthermen
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Bundesbank-Bunker Cochem
Bunker Cochem · Moselle · Rhineland-Palatinate
Disguised as two residential buildings, the Bundesbank stored its contingency currency here in the event of a nuclear war: 300 metres of corridors, 1,500 square metres of floor space, vaults and a kitchen capable of catering for 175 people.
- Temperature
- 12 °C
- Duration
- 40 min
- Route
- 300 m
- Adults
- €14.00
In summer, hourly every day (from 1 July, 10.30 am–4 pm); in winter, the service is significantly reduced and mainly runs at weekends. bundesbank-bunker.de
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Amphitheater Trier – Arenakeller
Catacomb Trier · Moselle · Rhineland-Palatinate
Beneath the arena lies a basement containing the remains of stage machinery and cages for humans and animals; it was uncovered around 1908. During the interactive tour, a gladiator leads the way through the cellars and tunnels.
- Adults
- €6.00
Open daily all year round; April to September 9 am–6 pm, shorter opening hours in winter; last admission 30 minutes before closing time. Closed on Rose Monday, Christmas Day, New Year’s Eve and New Year’s Day. zentrum-der-antike.de/monumente/amphitheater
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Besucherbergwerk Fell
Show mine Fell · Moselle · Rhineland-Palatinate
Two slate quarries, one above the other, connected by a 100-metre-long stairwell. Roofing slate was quarried here right up until the 20th century; at the top, the quarry trail passes ten further quarries.
- Temperature
- 12 °C
- Duration
- 60 min
- Adults
- €10.00
1 April to 31 October, Tue–Sun and public holidays, 10 am–6 pm; guided tours run approximately every 45 minutes without prior booking, with the first tours between 10.30 am and 11 am and the last at 4.50 pm. bergwerk-fell.de
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Felsenkeller Weinkeller Schwaab
Rock cellar Koblenz-Güls · Moselle · Rhineland-Palatinate
A mountain tunnel beneath the steep slope of the Marienberg in Koblenz, originally built as a mine and now serving as a barrel and stainless-steel cellar for a winery. The tasting takes place down in the cellar, where the temperature remains consistently cool.
- Temperature
- 12 °C
- Duration
- 60 min
- Adults
- €19.00
Open sessions on Saturdays from 2 pm to 3 pm; groups by arrangement. weinkeller-schwaab.de/weinerlebnis/felsen…
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Weinkeller der Vereinigten Hospitien
Rock cellar Trier · Moselle · Rhineland-Palatinate
Germany’s oldest wine cellar, built within Roman storage halls dating from around 330 AD; in the late 7th century, the Merovingians constructed a ribbed vault within the ancient masonry. Wine has been matured here continuously since Napoleon established the foundation.
- Duration
- 60 min
- Adults
- €17.50
April to October: Wednesdays, Fridays and selected Saturdays at 11.00 am; guided tours in German only. weingut.vereinigtehospitien.de/pages/kell…
How this directory is made
It only lists places you can actually visit in 2026: show caves with guided tours, show mines, walk-in tunnels and bunkers. Museums without a way underground are left out, and so are sites that have closed. Prices, opening hours and temperatures come from the operators, and every entry names its source. If something could not be confirmed, it is missing rather than guessed. Place names stay in German, as they appear on signs and tickets.
What to expect underground
Underground it is the same temperature all year – between 3 and 20 °C at the places listed. Bring a jacket even in high summer, and sturdy shoes: paths are often wet and slippery. Most guided tours in Germany are in German only; many sites offer English leaflets or audio guides, so ask at the ticket desk. With a pushchair or wheelchair, use the filters above – far from every site is accessible.