The ancient Galata Tower is 9 stories high with restaurant on top, and is a must see in Istanbul. Check out our article: Galata Dining: 10 Restaurants in Istanbul’s Trendy Neighbourhood on The Culture Trip:
(Sultan Ahmet Camii) This is the Sultan Ahmet Mosque in Istanbul. It is also known as the Blue Mosque because of its blue tiles. It was built in 1609 by the Ottoman Sultan Ahmet I as the Islamic response to Hagia Sofia.