The oldest archaeological religious site ever discovered.  They date to 9,500 BC and indicate they were created by hunter gatherers. 

map showing location of site in southeastern Turkey

Göbekli Tepe Turkish: [ɡøbe̞kli te̞pɛ]  ("Potbelly Hill") is a Neolithic hilltop sanctuary erected at the top of a mountain ridge in the Southeastern Anatolia Region of Turkey, some 15 kilometers (9 mi) northeast of the town of Şanlıurfa(formerly Urfa / Edessa). It is the oldest known human-made religious structure. The site was most likely erected by hunter-gatherers in the 10th millennium BCE and has been under excavation since 1994 by German and Turkish archaeologists. Together with Nevalı Çori, it has revolutionized understanding of the Eurasian Neolithic.

• http://en.wikipedia.org/wiki/Göbekli Tepe
• Page 87 - Harari, Y. N., 2015, Sapiens: A Brief History of Humankind, HARVILL SECKER, 416p.