In the Levent area of Istanbul, there is a tall building called Sapphire. It is currently the tallest building in Istanbul, although that could very much change with the constant new construction sites in Levent and Maslak.
Anyway I was surprised that a lot of tourists I spoke with are not aware of Sapphire. You can go to the very top of the building and see a great view of Istanbul. It is not advised for those of you who fear heights 🙂 I have to say though that it remains to be one the of the best things I have visited in Istanbul, coming in second on my list after Topkapi Palace. So if you are thinking of things to do in Istanbul try a trip to Sapphire. Make a day of it as their is also a shopping mall on the ground floor. It is also an experience taking the lift to the top as your ears pop as if you were on a plane!
Here are some pics.