Hagia Sophia is open for visit every day except Mondays.
The winter visiting hours for the Hagia Sophia are from 09.00 to 17.00, with the final entry being at 16.00. During the summer, the visiting hours are between 09.00 and 19.00, with the final entry being at 18.00. Passes are available at the box office in the museum.
It was used as a church for 916 years but, following the conquest of Istanbul by Fatih Sultan Mehmed, the Hagia Sophia was converted into mosque. Afterwards, it was used as a mosque for 482 years. Under the order of Atatürk and the decision of the Council of Ministers, Hagia Sophia was converted into a museum in 1935.