Berlin, Germany
Berliner Unterwelten (Subterranean Berlin)
A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.
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Berlin, Germany
A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.
Saint-Pierre-Colamine, France
A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.
Naours, France
A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.
Jaca, Spain
This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.