St. Pietersberg Caves – Maastricht, Netherlands - Atlas Obscura
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St. Pietersberg Caves

Incredible labyrinth of man made caves. 

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Ancient limestone quarry tunnels are decorated with generations of graffiti. During WWII the tunnels were converted for use as an air raid shelter, but were never used. Fossils of a prehistoric Mosasaurus and turtle discovered here are now on display at the Maastricht Natural History Museum.

One tour per day in English.

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