Last month I was in Istanbul just for 5 days, and also I had a chance to visit Istanbul Modern and see Burhan Doğançay' s work of art. If you like to be a part of city life, you should see that exhibition of urban walls. It reflects a good temporal reference. Especially, there are lots of work from New York and Istanbul. You may feel yourself taking the metro in New York.
The exhibiton ends in Sept. 23rd.