Haghia Sophia, is the most famous museum in Turkey and one of the greatest marvels of architecture. Hagia Sophia was built as a church in the 6th century by Emperor Justinian then in 1453 renovated into a mosque by Ottoman Emperor Fatih Sultan Mehmet. It was converted into a museum in 1935 and welcomed both local and foreign visitors. Grand Bazaar, is the biggest market and the most attractive shopping center of Istanbul which has lots of shopping opportunities with carpets, leather, jewelry, Turkish delight, gold, antique tiles, etc.. (Closed on Sunday)