HistoryNeolithic (c. 9600–8000 BCE)Southeastern Turkey (Upper Mesopotamia)low confidence

Göbekli Tepe's largest enclosure, Building D, measures at least 65 feet across and contains two freestanding limestone pillars each 18 feet tall and weighing an estimated 8 tons.

Notes on verification

Matches original Archaeology Magazine reporting verbatim; corroborated by Templeton.org, Smithsonian Magazine, and the German Archaeological Institute's excavation blog. Minor variance in weight estimates (8-10 tons) across sources, but the 8-ton figure is directly supported by primary excavation source.

Sources