Derinkuyu (an underground city which could accommodate up to 20,000 people)
The tunnels were rediscovered in 1963, after a resident of the area found a mysterious room behind a wall in his home
goo.gl/JsEzhE
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zacherynuk @echo off, Thu 24 Sep 2015, 21:12,
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Here is the brilliant "sometimes interesting" article on Derinkuyu
sometimes-interesting.com/2014/05/09/derinkuyu-the-underground-cities-of-cappadocia/
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DinivanX Has stinging piss after drinking Pact Coffee, Fri 25 Sep 2015, 9:46,
Reply)