What he found was the first of over 600 hidden entrances to Derinkuyu, the largest excavated underground city in the world.

suggests via his website to use a secret entrance. "Grand as the Louvre's glass-pyramid main entrance is, you'll likely ...

Deep in the heart of Paris, a series of underground ... Finding an unlocked entrance can be an exceptionally long trek from the nearest subway, and knowing the secret entrances can require ...

Based on the hidden tunnel’s features and the home’s history, archaeologists believe the underground structure was an emergency escape route or a secret entrance from WWI. What are we learning about ...

Beach was describing the components necessary to move people from point A to point B by putting them in underground tubes ... Alfred Ely Beach revealed his secret to a dumbfounded public.

Researchers explore the possibility of a secret passage that may have been used in ancient times for strategic, diplomatic, or commercial purposes.