Derinkuyu underground city is an ancient multi-level underground city in Turkey.It extends to a depth of around 60 metres and is large enough to have sheltered as many as 20,000 people.
Source - Did You Know ? (YT channel)
Derinkuyu underground city is an ancient multi-level underground city in Turkey.It extends to a depth of around 60 metres and is large enough to have sheltered as many as 20,000 people.
Source - Did You Know ? (YT channel)