Who built Göbekli Tepe?

Göbekli Tepe (Turkish for "Potbelly hill") is a hilltop sanctuary erected on the highest point of an elongated mountain ridge some 15 km northeast of the town of Şanlıurfa (formerly Urfa / Edessa) in southeastern Turkey. Göbekli Tepe is the oldest human-made place of worship yet discovered.[ The site, currently undergoing excavation by German and Turkish archaeologists, was erected by hunter-gatherers in the 12th millennium BC (c. 11,500 years ago), before the advent of sedentism. Together with Nevalı Çori, it has revolutionized understanding of the Eurasian Neolithic.