Discovered beneath a Byzantine-era hilltop castle in Nevşehir, the provincial capital, the site dates back at least to early Byzantine times. It is still largely unexplored, but initial studies suggest its size and features may rival those of Derinkuyu, the largest excavated underground city in Cappadocia, which could house 20,000 people
Click on the link and go exploring on Video plus see photos
http://news.nationalgeographic.com/2015/03/150325-underground-city-cappadocia-turkey-archaeology/
WATCH: A laser scan-generated video explores a series of interconnected corridors and rooms in the underground city. Video courtesy Nevsehir Municipality
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