Göbekli Tepe

Around 8200 BC, work at Gobekli Tepe stopped, and the site fell into decay.

An excerpt from the article 18 facts about Göbekli Tepe
Archaeologists found no traces of the inhabitants there (hearths, houses, graves), only thousands of gazelle and tortoise bones, which the builders must have eaten. It seems to have been a place of some cult, a ceremonial center.