Haghia Sophia was converted into a mosque in 1453, shortly after the conquest. Apart from whitewashing the paintings and mosaics and removing the Christian icons and statues, the Turks left Haghia Sophia untouched.
Haghia Sophia
Haghia Sophia, or the "Church of Holy Wisdom", was built by the Emperor Justinian in the 6th century. It covers a total area of 7570 square meters and is over 100 metres long.