|The Hagia Sophia. A church from Byzantine times 537 AD. It was the largest church in the world until the 1600s.|
It was converted into a Mosque in the 1400s, when the minarets were added. In 1931 it became a museum.
|The Blue Mosque (it's not this blue it is a trick of the light and Photoshop).|
Finished in 1616 when Istanbul was the Capital of the Ottoman Empire.