Hagia Sophia, located in Istanbul, Turkey, is a historic site that has served as a church, mosque, and museum over the centuries. Built in 537 AD by the Byzantine emperor Justinian I, it is renowned for its impressive architecture, including a massive dome and intricate mosaics. The building has played a significant role in both Christian and Islamic history, witnessing events like the East-West Schism and the Ottoman conquest of Constantinople. Today, Hagia Sophia stands as a symbol of cultural and religious significance, attracting visitors from around the world to marvel at its rich heritage.