How many times has humanity been wiped down to near extinction?

Gobekli Tepi was the side of a moderate village. It consists of a temple about about 20 buildings.

That's hardly an 'advanced civilization'. That's a village. The entire site is about 20 acres
Gobekli Tepi is about 100 buildings. They were cutting, accurately carving, transporting and placing 20 ton stones.

Maybe the 20 got you confused?
 

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