Hagia Sophia is a former Orthodox patriarchal basilica, later a mosque, now a museum in Istanbul, Turkey. From the date of its dedication in 360 until 1453, it served as the cathedral of Constantinople except between 1204 and 1261, when it was the cathedral of the Latin empire. The building was a mosque from 23 May 1453 until 1934, when it was secularized; it was opened as a museum on 1 February 1935. (Location: İstanbul)

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