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The massive underground city of Derinkuyu in Cappadocia, Turkey potentially housed twenty thousand people and their livestock. Engineers are baffled by Derinkuyu. It is multi-story with eighteen levels up to a depth of 85 meters. That is the equivalent of a 26 story building. It had flowing water, ventilation shafts, living quarters, shops, communal rooms, wells, tombs and escape routes. It is believed to have been built by the Phrygians in the 8th-7th centuries B.C. However, some of the lower l
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