(Sultan Ahmet Camii) This is the Sultan Ahmet Mosque in Istanbul. It is also known as the Blue Mosque because of its blue tiles. It was built in 1609 by the Ottoman Sultan Ahmet I as the Islamic response to Hagia Sofia.
The Sultan Ahmed Mosque (Turkish: Sultanahmet Camii) is an historical mosque in Istanbul, the largest city in Turkey and the capital of the Ottoman Empire (from 1453 to 1923). The mosque is popularly known as the Blue Mosque for the blue tiles adorning the walls of its interior.