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6 of 6 places
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Ubiermonument
Catacomb Köln · Rhineland · North Rhine-Westphalia
The corner tower of the Roman city wall, dating from 4/5 AD, now stands in the cellar of a residential building – Cologne’s oldest reliably dated structure, discovered by chance in 1965. The tuff blocks are joined without mortar using dovetail joints.
Every first Thursday of the month (Cologne Day) 2 pm–5 pm; at other times, only by prior booking for group or school tours. roemisch-germanisches-museum.de/Ubiermonument
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Atombunker Köln-Kalk
Bunker Köln · Rhineland · North Rhine-Westphalia
Cologne’s only fully preserved civil defence shelter, built in 1979/80 on an intermediate level of the Kalk Post underground station: 2,500 square metres, shelter for 2,366 people for 14 days, 40-centimetre-thick steel doors.
- Adults
- free
Public guided tour on the first Sunday of the month; booking required; places are snapped up quickly. welt.unter.koeln/1-Atombunker.html
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Kronleuchtersaal in der Kölner Kanalisation
Catacomb Köln · Rhineland · North Rhine-Westphalia
A junction structure in Cologne’s combined sewer system dating from 1890, situated seven metres below the Ring – and still in operation today. The name is taken from two chandeliers that were hung there for the inauguration; concerts are occasionally held here because of the acoustics.
- Duration
- 30 min
- Depth
- 7 m
March to October, regular guided tours; booking is only possible via the StEB Köln customer portal; places are limited. steb-koeln.de/magazin/kronleuchtersaal
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Ausgrabung unter dem Kölner Dom
Catacomb Köln · Rhineland · North Rhine-Westphalia
Beneath the cathedral lie over 2,000 remains of walls and foundations: Roman residential buildings, early Christian structures and the Carolingian Old Cathedral. Whilst the Praetorium is closed for the construction of the new MiQua building, this is the only major underground tour in Roman Cologne.
- Duration
- 90 min
- Adults
- €27.00
Open all year round; guided tours are available on weekdays between 3.30 pm and 6 pm, and on Saturdays between 10 am and 4 pm. Tickets are available online only. domfuehrungen-koeln.de/sonderfuehrungen/a…
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Erinnerungsbunker Aachen
Bunker Aachen · Rhineland · North Rhine-Westphalia
The city’s largest above-ground air-raid shelter, covering 2,700 square metres and preserved in its original condition. The guided tour explains the construction, technology and oxygen supply. Above ground, but as gloomy inside as any underground bunker.
- Temperature
- 11 °C
- Duration
- 120 min
- Adults
- €16.90
No fixed opening hours; appointments by request, except during Carnival and from 24 December to 1 January. erinnerungsbunkeraachen.de
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Winkelturm Köln-Niehl
Bunker Köln · Rhineland · North Rhine-Westphalia
A tapered air-raid tower of the ‘Winkel’ type, popularly known as the ‘Niehl cigar’. It provided shelter for around 600 factory workers and is built entirely above ground.
- Adults
- free
Guided tour on the third Saturday of the month; booking required. welt.unter.koeln
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.