Hagia Sophia

Hagia Sophia is one of the most important buildings ever constructed. Built by the Byzantine Emperor Justinian I in 537 AD, it served as the greatest Christian cathedral in the world for nearly a thousand years, then became a mosque after the Ottoman conquest of Constantinople in 1453, then a museum in 1934 under Atatürk's secular republic, and finally a working mosque again from 2020 onward. That arc alone — Byzantine Christian, Ottoman Islamic, secular monument, living mosque — tells the whole story of Istanbul, a city that has been at the center of civilizations for millennia. The building's central dome, 55 meters high and 31 meters wide, was the largest in the world when it was built and remained so for centuries. Standing inside it, you genuinely feel that.

Visitors enter the vast interior where Byzantine gold mosaics coexist with Ottoman calligraphic medallions and the structural bones of Justinian's original engineering. The famous Deësis mosaic in the upper gallery — Christ flanked by the Virgin Mary and John the Baptist — is considered one of the finest examples of Byzantine art in existence, its humanistic rendering far ahead of its time. The upper gallery offers vertiginous views down into the main nave and closer access to the mosaics. Because it is now an active mosque, prayer times punctuate the day and worshippers fill the space during the five daily salat, which is itself extraordinary to witness.

Since its reconversion to a mosque in 2020, non-Muslim visitors are still welcomed but the experience has changed. Entry is free, but certain areas are closed during prayer times and some mosaic zones may have restricted access. The building sits in Sultanahmet Square, directly across from the Blue Mosque, and the area around it is dense with vendors, tour groups, and genuine pilgrims. Come early in the morning — well before 9am if you can — to have any sense of the space before the crowds arrive. Remove shoes before entering and dress accordingly.