Galata tower

Galata tower is one of the more prominent features of the Istanbul skyline. It was built as a watch tower in 1348 by the Genoese, who settled on the north shore of the Golden Horn. It was once known as the tower of Christ, although this would have been inappropriate once subsumed under the Ottoman Empire.

Here is a great perspective shot of Sirin.

For a fee one can go to the top and squeeze in with the few dozen other tourists that are there enjoying the panoramic view. Here I am with part of the city in the background.