Officially called the Sultan Ahmed Mosque, this 17th-century masterpiece sits directly across from Hagia Sophia, facing it almost like a conversation across centuries. One (the Hagia) was once a church, then a mosque, then a museum, then a mosque again. The other (Blue) has been a mosque from the beginning and still welcomes worshippers five times a day. And yes, it really is blue. But maybe not in the way you expect. Why It’s Called the Blue Mosque The name comes from the mo