The Hagia Sophia in Istanbul, not far from the well known Blue Mosque, has been the centre point of the Eastern Orthodox Church for over one thousand years. The first recorded structure dates back to the 4th century. The current structure was built in the 6th century. In 1453, Sultan Mehmed II conquered Constantinople, renamed it to Istanbul and converted the Hagia Sophia to an Islamic mosque. Then, in 1935, with the secularization of Turkey under Kemal Ataturk, the Hagia Sophia was declared to be a state-owned museum. It still is an imposing edifice today.