Building D at Göbeklitepe is the best preserved of the monumental buildings so far excavated. The T-shaped pillars reach a height of approx. 5,5 metres and are carved from one piece of limestone. Interpreted as stylised representations of human-beings, the T-pillars appear to congregate (as if participating at a meeting) around the two taller central pillars. (Photo: DAI, Göbekli Tepe Archive)