At Istanbul, there are a lot of places to visit. But I choose top five places to go at Istanbul. Number one, Hagia Sophia. It was a church, but then it was turned to a mosque, and now it is used as a museum. It is a very old, and perfect structure. Number two, Taksim Square. Taksim Square is a beatiful place where there are small, beatiful shops, and nice restaurants. Many people walk past there everyday. Number three, Rumelihisari. It is a old Turkish castle that is infront of the bosphorus. If u climb up there you will have a nice view from top. Number four, Grand Bazaar. Grand Bazaar is a bazaar that is closed from top, and there are a lot of shops, and restaurants inside. You definetly won't have time to go in all of them. And Number five, it is not a location but something you should do if you go to Istanbul. You should have a trip at the bosphorus. While throwing your pretzel to the gulls you can watch the beatifull bosphorus, and the gulls eating the piece of pretzel you throw.