Derinkuyu: the ancient underground city, once home to 20,000 people

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In Ancient Turkey, underground dwellers were likely better protected than surface dwellers. During its peak, the underground city of Derinkuyu served as a safe haven for 20,000 people; when under attack, the city’s entrances could be blocked off with stones. If invaders managed to push through, they would be forced to pass through the narrow tunnels one at a time, slowing their attack and providing citizens enough time to escape through secret passageways. Read full article here

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