The Sultanahmet Camii (Sultan Ahmet Mosque), was comissioned by Sultan Ahmet. Construction began in 1609 and took seven years. The mosque is commonly referred to as the Blue Mosque, due to the 20,000 blue tiles adorning its interior.
One of the most notable features of the mosque are its six minarets. This is very unique, as most mosques have four, two, or just one minaret. According to one account, the Sultan directed his architect to make gold (altin) minarets, which was misunderstood as six (alti) minarets. Whatever the origins of the unique feature, the six minarets caused quite a scandal, as the Haram Mosque in Mecca (the holiest in the world) also had six minarets. In the end, the sultan solved the problem by sending his architect to Mecca to add a seventh minaret.