Blue Mosque, located in Istanbul, is the only mosque in the world with six tall towers. It is also the landmark of Istanbul. Its main body is blue, which is composed of more than 20,000 blue tiles. In the interior of the dome, the chandeliers are extremely luxurious. The sunlight shines through the colored glass of 260 small windows, and the golden blue is brilliant and dazzling. To get into the queue, you have to take off your shoes and cover your head. No flash is allowed for photography.