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Hagia SophiaAyasofya
Dating from the sixth century, it was originally a basilica built for the Eastern Roman Emperor Justinian I. A masterwork of Roman engineering, its 30 m dome covered what was for over 1,000 years the largest enclosed space in the world. The church was looted during the Fourth Crusade in 1204 and became a mosque in the 15th century when the Ottomans conquered the city. It was converted into a museum in 1935 and reopened as a mosque in 2020. Don’t miss the remarkable mosaics in the upper gallery.