The Sultan Ahmet Mosque [Material from Wikipedia] The Sultan Ahmet Mosque 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. It was built from 1609 to 1616, during the rule of Ahmed I. Like many other mosques, it also comprises a tomb of the founder, a madrasah and a hospice. While still used as a mosque, the Sultan Ahmed Mosque has also become a popular tourist attraction. [KhD says] That is really beautiful place. When I look at Sultan Ahmet Mosque or any other mosques in Istanbul I have a feeling that I am in Constantinople in 14th century. I'll show the a picture of blue tiles adorning the walls of mosque's interior next time.