Hagia Sophia, located in Istanbul, Turkey, is a stunning blend of Byzantine and Ottoman architectural styles. Originally built as a cathedral in 537 AD, it was the world’s largest cathedral for nearly a thousand years. In 1453, it was converted into a mosque by the Ottoman Empire and later became a museum in 1935. Since 2020, it has functioned as a mosque again. Its grand dome, exquisite mosaics, and marble pillars showcase a rich history and cultural significance, drawing millions of visitors annually to admire its awe-inspiring interior and grandeur.