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The underground city of Derinkuyu reaches a depth of 60m (200 feet) and used to shelter as many as 20.000 people; it's the largest of the 200 underground cities discovered in Cappadocia, Turkey [5339x3496]
Here is the artist's twitter! https://twitter.com/SirLazz/status/1617236967879577604?t=7MX86DHJHj92mBtri3xP6w&s=19