No visit to Istanbul is complete without a visit to the Hagia Sophia. Built as a church around mid 5th century, it was converted to a mosque after the Ottomans took over Istanbul. Since Turkey became a republic, it is now a museum, and the visitors are able to experience more than millennium worth of art and architecture.
The Cloud Gate and the Chicago skyline
Tram from Tunel to Taksim on Istikat Cadesi, Istanbul.