Istanbul is the ancient city of Constantinople. It is a beautiful modern city with numerous important sites to see. We enjoyed going to the Grand Bazaar, which dates from the 6th century BC (58 streets and 4500 shops). It is the largest indoor mall! While there we also went to the Chora (Country) Church, the Famous Sultan Ahmed (Blue) Mosque, and Hagia Sophia. One would do well to read the main article at wikipedia and then the links at “See Also” section.