Hagia Sophia Grand Mosque

The Hagia Sophia Grand Mosque is defined by a massive central dome that appears to float above the structure. Designed by the Greek geometers Isidore of Miletus and Anthemius of Tralles, the building was completed in five hundred thirty-seven for the Byzantine Emperor Justinian the First. For nearly a millennium, it held the title of the largest cathedral in the world, serving as the spiritual center of the Eastern Orthodox Church.