The Basilica Cistern (Yerebatan Sarnıcı) is the largest surviving Byzantine underground water reservoir, completed under Emperor Justinian I in the 6th century and nicknamed the 'Sunken Palace' for its forest of 336 marble columns. It is famous above all for the two ancient Medusa-head column bases in the northwest corner — one set sideways, one upside down — and for the mirror-like reflections of the columns in the dim, atmospheric lighting. After a major 2020–2022 restoration and seismic reinforcement it reopened in July 2022, and now doubles as a cultural venue with sculpture and light installations and occasional evening concerts. Compact and cool, it makes a 30–45 minute stop that pairs naturally with Hagia Sophia and the Blue Mosque nearby in Sultanahmet.
The two Medusa-head column bases in the northwest corner — one on its side, one inverted — with several competing theories for why.
The 'Crying Column' (Hen's Eye Column), carved with peacock-eye and teardrop motifs, said to honor slaves who died during construction.
336 marble columns in 12 rows of 28, doubled by their symmetrical reflection in the still water.
The 6th-century Byzantine brick floor uncovered in the 2022 restoration, viewed from the new raised walkways.
Fish gliding through the shallow water beneath soft lighting and art installations, creating a cool, dreamlike mood.
Good to know
RulesOperated by the Istanbul Metropolitan Municipality (İBB), so the Museum Pass Istanbul is NOT accepted — you need a separate ticket. Cash is not taken; pay by card or İstanbulkart only.
CautionBeware touts and unofficial 'skip-the-line' ticket sellers near the entrance, and 'free' guides who then demand a tip. Buy tickets only from the official site (yerebatan.com) or Passo.
SafetyThe interior is dark and the walkways are wet and slippery, with steps at the entrance — wear non-slip shoes and watch your footing. Sultanahmet square and the crowded tram are pickpocket hotspots, so keep your bag in front.
SeasonUnderground it stays around 15°C year-round and damp; a light layer is welcome even in high summer (Jul–Aug). In peak season queues can top an hour, so book online and enter by QR code to skip the line.
MannersThis is a quiet heritage space — avoid loud talking and disruptive filming, don't toss coins into the water, and don't touch the Medusa heads or other stonework.
RulesVisits are split into a daytime session (09:00–18:30) and an evening session (19:30–22:00), with entry closed 18:30–19:30 for the changeover; the evening session costs more — confirm the latest details before you go.
Practical info
It is a 2–3 minute walk from the Sultanahmet stop on the T1 tram line, about 150 m from Hagia Sophia. Open daily 09:00–22:00 (closed 18:30–19:30 for the session changeover); fares and hours change often, so check the official site for the latest.
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