The dome's original structure partially collapsed after an earthquake in 558 AD and was rebuilt with a higher curvature to distribute weight more efficiently.
The four minarets surrounding the structure were added at different periods by different Ottoman Sultans, most notably Mimar Sinan.
The central dome is supported by forty windows at its base, creating an optical illusion that the dome is floating on light.
A Viking graffito, believed to have been carved by a member of the Varangian Guard in the 9th century, exists on one of the upper-gallery marble balustrades.
The building's floor is composed of Proconnesian marble slabs sourced from the Marmara Sea, featuring intricate 'opus sectile' geometric patterns.
During the Ottoman period, the Byzantine mosaics depicting religious figures were plastered over to comply with Islamic aniconism, preserving them from environmental degradation.
The 'Weeping Column' or 'Sweeping Column' in the northern aisle is believed by local tradition to have healing properties if a finger is placed in its damp hole.
The building was the world's largest cathedral for nearly a millennium until the completion of Seville Cathedral in 1520.
Hagia Sophia is a monumental structure originally constructed as a Christian cathedral in 537 AD, later converted into a mosque in 1453, a museum in 1935, and a functioning mosque again in 2020. The primary architectural feature is its massive central dome, which reaches a height of 55 meters and relies on pendentives to transfer weight to four large piers. The interior walls are covered in extensive marble paneling and intricate Byzantine gold mosaics, alongside large circular wooden calligraphy disks added during the Ottoman era. Following its 2020 transition to a mosque, the building is now officially known as the Hagia Sophia Grand Mosque. The structure serves as the heart of Istanbul's Sultanahmet district and remains a UNESCO World Heritage site as part of the Historic Areas of Istanbul. Visitors enter through the Imperial Gate, which historically served as the entrance for the Byzantine Emperor. The site houses the tomb of Sultan Selim II and other members of the Ottoman dynasty within its garden complex.
From the second-floor gallery windows looking down toward the main altar and the large calligraphy medallions.
Visit during non-prayer times to avoid the busiest influx of congregants.
Ensure your itinerary accounts for security lines that fluctuate significantly throughout the day.
Carry a bag to hold your shoes, as you must remove them before walking on the carpeted prayer hall floor.
Avoid attempting to visit during Friday midday prayers when the building is restricted to worshippers only.
Access for tourists may be restricted or paused during daily prayer times and Friday congregational prayers.
Strict dress code: women must cover their hair, and both genders must cover shoulders and knees. Shoes must be removed before entering the carpeted area. Silence is required inside.
