Istanbul's Hagia Sophia, a former church, museum, and now mosque, captivates tourists. Initially a 6th-century Byzantine basilica, its immense size and lavish marble decorations are unmatched. Built by order of Emperor Justinian I, it served as a Christian center for nearly 1000 years before Ottoman conquest transformed it into a mosque. Despite its current status, the Hagia Sophia remains a major tourist attraction, drawing millions annually to marvel at its architectural grandeur and historical significance, with visitors now allowed access to the upper level only.

Prepared by Emily Rhodes and reviewed by editorial team.