トルコ・カッパドキアの地下から約５０００年前の都市が発見される

http://www.independent.co.uk/news/world/middle-east/vast-5000-yearold-underground-city-discovered-in-turkeys-cappadocia-region-9951911.html 
http://www.independent.co.uk/incoming/article9951921.ece/alternates/w460/Derinkuyu.jpg