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Hagia Sophia Museum is one of the most beautiful buildings
Hagia Sophia is often referred to as the eighth wonder of the World. The Hagia Sophia (Ayasofya in Turkish) in Sultanahmet is easily one of Istanbul's most impressive sights. It also must have one of the most turbulent histories of any museum in the world. It was once a church and a mosque but is now one of the most visited museums in the world.