Gaziantep Castle Located at the heart of Gaziantep in Turkey, Gaziantep Castle stands atop a hill. Originally used by the Hittite Empire as an observation point, the castle was later transformed into the primary castle of the Roman Empire. Emperor Justinianus expanded and renovated it between 527 AD and 565 AD. Constructed from stone, the walls of Gaziantep Castle encircle an area of 1200 meters, and feature 12 towers which served as living quarters for soldiers, as well as housing various other chambers such as stables, prison cells, treasure trove storerooms, and barracks for troops. The castle has undergone many renovations throughout its history, with its most recent transformation taking place in 2000. It is now home to the Gaziantep Defence and Heroism Panoramic Museum, which showcases a documentary about the city's defense against French forces.