Hagia Sophia Guide 2026: History, the 2020 Reconversion and Visiting as a Tourist

Hagia Sophia was built in 537 AD as the main cathedral of the Byzantine Empire, standing as the largest Christian church in the world for nearly a thousand years and a defining example of Byzantine architecture, particularly its massive central dome. After the Ottoman conquest of Constantinople in 1453, Sultan Mehmed II converted it into a mosque, adding minarets and covering (rather than destroying) most of its Christian mosaics with plaster, a practice that inadvertently preserved them for centuries. In 1935, the secular Turkish Republic under Atatürk converted it into a museum, stripping back some of the plaster to reveal the Byzantine mosaics alongside Islamic calligraphy — a deliberate symbol of a shared, layered heritage open to all.

In July 2020, Turkey's Council of State annulled the 1935 museum decree and President Erdoğan signed a decree reconverting Hagia Sophia into an active mosque, a decision that drew significant international criticism, including from UNESCO (which maintains the site on its World Heritage list) and several governments, over concerns about the status of its Christian iconography and its symbolic weight. The decision remains genuinely contested and politically significant in a way most tourist landmarks aren't, worth knowing before you visit rather than treating it as simply another historic sight.

Since reconverting to a mosque, some of Hagia Sophia's most famous Christian mosaics — including depictions of Christ and the Virgin Mary in the upper galleries — are covered during prayer times with curtains or screens rather than removed, and visible to visitors outside those windows, a compromise that satisfies neither side completely but keeps both the religious function and the heritage visible in practice. The upper gallery, where many of the best-preserved mosaics are located, has had restricted or separate access arrangements since the conversion, so check current visitor information before planning a visit built specifically around mosaic viewing.

The building's floor is now carpeted for prayer, a visible, immediate difference from its museum-era bare marble, and the overall visitor experience shifted from a self-paced museum wander to something closer to visiting any other major working mosque in Istanbul, just with far more history attached.

Entry is free, as with other active mosques in Turkey, and there's no advance ticket required the way there is for Topkapi Palace. Modest dress is required: shoulders and knees covered for everyone, and headscarves are provided for women at the entrance if needed (bring your own if you'd rather). Shoes come off before entering the carpeted prayer area, with bags provided to carry them. Arrive outside the five daily prayer times for the fullest, least-restricted visit — Friday midday prayers in particular draw the largest crowds and the tightest visitor access.

Photography is generally allowed in the main hall, but be mindful and quiet around anyone actively praying, and avoid flash photography or treating worshippers as photo subjects. A guided tour that times the visit around prayer schedules and explains the layered history on-site adds genuine value here, more than at almost any other Istanbul landmark.