Hagia Sophia

Hagia Sophia, in Istanbul’s historic peninsula, is a masterpiece of Byzantine and Ottoman heritage. Built in 537 as an imperial church, later converted to a mosque, it now serves as a working mosque and museum space. Visitors come for its vast dome, intricate mosaics, marble pavements, and calligraphic roundels. The interior illustrates centuries of religious and political change in one monumental space. Expect queues and modest dress requirements; entry is free, with restricted access during prayers. Its scale, acoustics, and layered history make it a compelling stop for architecture enthusiasts, history lovers, and first-time visitors to Istanbul.