The magnificent Blue Mosque (Sultan Ahmet Camii) - built in the sixteenth century - is a world-famous landmark that is an essential part of any visit to Istanbul. Admire the use of six slender minarets to guard the huge open courtyard, and be amazed by the large prayer hall - covered by a dominant dome - with the internal ceiling decorated with intricate blue iznik tiles. As you explore this mosque, absorb the history and respect its religious operation by avoiding prayer times and dressing in accordance with regulations.