Basilica Cistern — Istanbul's Underground Palace
Explore the ancient underground water cistern with 336 marble columns, atmospheric lighting, and the mysterious Medusa heads.
History
Built in 532 AD by Emperor Justinian I, the Basilica Cistern is the largest surviving Byzantine cistern in Istanbul. It could hold 80,000 cubic meters of water, supplied via aqueducts from the Belgrade Forest. The cistern was forgotten for centuries until French scholar Petrus Gyllius rediscovered i
What to See
The cistern features 336 marble columns, each 9 meters high, arranged in 12 rows of 28 columns. Many columns were recycled from ruined temples across the Byzantine Empire. Two Medusa head column bases — one sideways, one upside-down — are the most photographed features. After a major 2022 renovation
Visiting Info
Open daily 9:00–19:00 (last entry 18:30). Ticket: approximately 450 TL. Located just 150 meters from Hagia Sophia in Sultanahmet. The temperature inside is a cool 14°C year-round — bring a light layer. Photography is allowed. Wheelchair accessible via elevators installed in 2022.
Frequently Asked Questions
How deep is the Basilica Cistern?
About 9 meters deep with 336 marble columns, each 9 meters tall.
What are the Medusa heads in the Basilica Cistern?
Two column bases feature carved Medusa heads — one sideways and one upside-down, likely recycled from Roman ruins.
Is the Basilica Cistern worth visiting?
Absolutely. After the 2022 renovation, it features stunning lighting, art installations, and walkways.