Top 1 in Top 10 Most picturesque locations in Turkey.
Hagia Sophia was originally a Eastern Orthodox Church basilica, later a Muslim mosque, and now a museum in Istanbul, Turkey. Particularly famous for its large vaulted ceilings, the building is considered an exemplary image of Byzantine architecture, and is deemed to have "changed the history of Architecture". It was the largest church in the world for almost a thousand years, until the cathedral of Sevilla was completed in 1520.