The Underground Atlas collects the places below ground you can actually visit – catacombs, show caves and ice caves, sea grottoes, salt mines, cisterns, bunkers and underground cities.
How these pages are made
Every figure on this site has a source, and the sources are listed at the end of each page. Operators come first, then authorities and tourist boards. What cannot be sourced is not here. Prices and opening hours carry a date, because they change.
Each place has a section called “What the internet gets wrong”. Travel sites copy from one another, which is how old prices, wrong closing days and outdated rules survive for years. Where I find one, the correction is there with the evidence – naming the page that has it wrong.
Sister site in German
This atlas began in German at unterwelt-atlas.de, which covers more than fifty places plus a directory of every visitable site below ground in Germany. The English pages are not translations: the measured figures are shared, but prices are converted for an international reader and the corrections are researched against English-language sources, because a myth that circulates in German is rarely the same one that circulates in English.
How the site pays for itself
Booking buttons lead to GetYourGuide. Those are affiliate links: if you book through one, I earn a commission and your price stays the same. Where the operator sells more cheaply itself, the page says so – with a link to the official site. There are no cookies, no tracking and no third-party scripts.
Who is behind it
The Underground Atlas is a project by Kai Rauch in Berlin, who also runs Spreefahrten Berlin and Hamburg-Rundfahrten. Found a mistake? A short message to the address in the legal notice is enough.