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Hagia Sophia

Istanbul, Turkey

Architecture

20 of the World's Largest Religious Structures

Few religious buildings have lived such a fascinating history as Istanbul's Hagia Sophia.

This architectural wonder was first constructed by the Byzantines in the sixth century as a Christian church. When the Ottomans conquered Constantinople in 1453, they converted it into a mosque. In 1934 it was turned into a museum, and again a mosque in 2020. The enormous building is arguably the finest known example of Byzantine architecture — inside are 104 columns brought from the Temple of Artemis in Greece, while outside, four minarets and a 108-foot-wide dome dominate the skyline of Istanbul's Old City.

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