Grand Bazaar (or "Kapalıçarşı" in Turkish) is one of the largest and oldest covered markets in the world. You can find unique Turkish products and souvenirs, spices, beautiful ornamental lamps, soaps, ceramic plates, and lots and lots more. You can also get a cup of turkish coffee from the cafes in the bazaar if you want.

It is best to visit in the early morning if you want avoid big crowds. And it is a really good place to find various souvenirs for you and your loved ones.