Göbekli Tepe (Turkish: [ɡøbe̞kli te̞pɛ], ""Potbelly Hill"") is an archaeological site at the top of a mountain ridge in the Southeastern Anatolia Region of Turkey, approximately 12 km (7 mi) northeast of the city of Şanlıurfa. The tell has a height of 15 m (49 ft) and is about 300 m (984 ft) in diameter. It is approximately 760 m (2,493 ft) above sea level. It was excavated by a German archaeological team under the direction of Klaus Schmidt from 1996 until his death in 2014.The tell includes two phases of ritual use dating back to the 10th-8th millennium BCE. During the first phase, pre-pottery Neolithic A (PPNA), circles of massive T-shaped stone pillars were erected. More than 200 pillars in about 20 circles are currently known through geophysical surveys. Each pillar has a height of up to 6 m (20 ft) and a weight of up to 20 tons. They are fitted into sockets that were hewn out of the bedrock.In the second phase, pre-pottery Neolithic B (PPNB), the erected pillars are smaller and stood in rectangular rooms with floors of polished lime. Topographic scans have revealed that other structures next to the hill, awaiting excavation, probably date to 14-15 thousand years ago, the dates of which potentially extend backwards in time to the concluding millennia of the Pleistocene. The site was abandoned after the PPNB-period. Younger structures date to classical times.The purpose of the structures is not yet clear. Excavator Klaus Schmidt believed that they are early neolithic sanctuaries.