When you view the early 17th-century Blue Mosque from the outside, you may wonder why it’s called, “blue”. However, step inside the mosque and see that the 45-meter high dome and interior walls are decorated with 21,043 blue tiles - each handcrafted in the workshops of Iznik and Kütahya in the late 16th and early 17th centuries. Locally, the mosque is also known as Sultanahmet Mosque: named after Sultan Ahmet I who commissioned the mosque when he was just 19 years old. It would become the last imperial mosque of the Ottoman’s classical period for architecture, the only mosque to have six minarets, and the sultan’s final resting place in 1617 – only a year after the mosque’s completion. Today visitors are free to enter the Blue Mosque after prayer time to view and photograph the colorful interior, but do keep noise and flash photography to a minimum to respect local worshipers who come here to pray throughout the day.