Maiden's Tower was first built by the ancient Athenian general Alcibiades in 408 BC to control the movements of the Persian ships in the Bosphorus strait. Back then the tower was located between the ancient cities of Byzantion and Chrysopolis. The tower was later enlarged and rebuilt as a fortress by the Byzantine emperor Alexius Comnenus in 1110 AD, and was restored and slightly modified several times by the Ottoman Turks, most significantly in 1509 and 1763. The most recent facelift was made in 1998. Steel supports were added around the ancient tower as a precaution after the 17 August 1999 earthquake.
I would like to see a longer exposure with this nice composition. You did a good work leaving this big piece of sky there but maybe with more exposure you would even get more details and colors at the blue sky.