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Muslims attend Friday prayers outside Hagia Sophia Grand Mosque in Istanbul July 24. Hagia Sophia was built as an Orthodox Christian cathedral and stood as the seat of Eastern Christianity for a thousand years before Ottoman Turks conquered its host city and turned it into a mosque in 1453. In 1934, it was designated as a museum revered as a symbol of Christian and Muslim unity until being transformed back into a mosque in July. (CNS/Reuters/Umit Bektas)