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It is actually not a mosque right now, a museum instead. Hagia Sophia was built in th 6th century by Byzantium as a cathedral, and it was converted into a mosque by the Ottomans after overtaking Istanbul. When the Turkish Republic was founded in the 20th century, Hagia Sophia started to serve as a museum. Just a side note

For more pictures from Turkey, you can try: Pictures of Turkey Maybe might help