Gaziantep Castle

Gaziantep Castle, is a castle first built by the Hittite Empire as an observation point and later built into a main castle by the Roman Empire on top of a hill in the center of Gaziantep, Turkey in 2nd and 3rd century AD. It underwent further expansion and renovation under Emperor Justinianus between 527 and 565 AD.^[1] The circumference of the round shaped castle is 1200 meters. The walls are built of stone and the castle consists of 12 towers.

• http://en.wikipedia.org/wiki/Gaziantep Castle