 Yedikule Fortress

Yedikule Fortress ( or "Yedikule Zindanları"; meaning "Fortress of the Seven Towers", or "Dungeons of the Seven Towers", respectively) is a fortified historic structure located in the Yedikule neighbourhood of Fatih, in Istanbul, Turkey.Built in 1458 on the commission of Ottoman Sultan Mehmed II, the seven-tower complex was created by adding three new towers and fully enclosing a section of the ancient Walls of Constantinople, including the two twin towers that originally constituted the triumphal Golden Gate () built by Roman Emperors Theodosius I and Theodosius II.