Hidden beneath Turkey's Cappadocia region, Derinkuyu is a vast underground city that once housed 20,000 people and remains a marvel of ancient engineering.

The Paris Catacombs are 65 feet underground. The ancient city of Derinkuyu lies 279 feet below Turkey. The Greenbrier Bunker in W. Virginia is 720 feet underground. It was built to keep Congress ...

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A man from Derinkuyu, in the Nevsehir province of Turkey was renovating his basement. Using only a sledgehammer, he broke through one of his walls; and felt cool air coming in from the other side.