Maiden’s Tower (”Kız Kulesi“ in Turkish and ”Tour de Léandre“ in French): an iconic symbol of Istanbul, found on postcards, keychains and whatnot. It can be seen closely from Üsküdar’s water front, where you can have tea with your lover or friends. I didn’t have the opportunity to try this, but it seems that the view is amazing in sunset, especially in summer!
Side note: Whichever angle you photograph it from, you’ll get an amazing view, and there’s always a fabulous skyline in the background! Maşallah!