ancient underground city...
https://www.wikiwand.com/en/Derinkuyu_underground_city
https://www.wikiwand.com/en/Derinkuyu_underground_city
Derinkuyu underground city | Wikiwand
The Derinkuyu underground city is an ancient multi-level underground city in the Derinkuyu district in Nevşehir Province, Turkey, extending to a depth of approximately 85 metres .Wikiwand
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