Sultan Ahmet I's grand architectural gift to his capital was this beautiful mosque, commonly known as the Blue Mosque today. 

Built between 1609 and 1616, the mosque caused a furore throughout the Muslim world when it was finished, as it had six minarets (the same number as the Great Mosque of Mecca). A seventh minaret was eventually gifted to Mecca to stem the dissent.

The mosque gets its nickname from its interior decoration of tens of thousands of Iznik tiles.