Monument · Sultanahmet, Istanbul

Basilica Cistern

Basilica Cistern
Photo: Diego Delso, CC BY-SA 4.0 via Wikimedia Commons

The Basilica Cistern is a large subterranean water reservoir built by Emperor Justinian I. It holds 336 marble columns that support the brick vaulted ceiling. Two columns rest on Medusa head bases near the back of the walkway.

Updated September 27, 2026On day 1 of Istanbul: Two Continents

Visiting Basilica Cistern: what to know

Tickets
Admission fee required; check current rates at the entrance.
Time needed
45 to 60 minutes.
Best time
Early morning to avoid tour groups.
Getting there
Five-minute walk from Hagia Sophia in Sultanahmet.

Istanbul itineraries with Basilica Cistern

Day 1 of Istanbul: Two Continents

Sultanahmet monuments

How Basilica Cistern fits into a day.
  1. 9:00Hagia SophiaHagia Sophia
  2. 10:45Basilica CisternBasilica Cistern
  3. 11:45Blue MosqueSultan Ahmed Mosque
  4. 14:30Topkapi PalaceTopkapi Palace
See all 5 days
Advertisement
Ad space · 728 × 90

Basilica Cistern FAQs

What is the Basilica Cistern?

It is an ancient underground water storage system from the Byzantine period. The site now serves as a preserved historic monument open to visitors.

Are there Medusa heads in the cistern?

Yes. Two column bases feature carved Medusa heads, one inverted and one sideways, at the northwest corner.

Is the Basilica Cistern accessible?

Raised walkways allow visitors to walk above the water. The entrance includes stairs and may not suit all mobility needs.

More places on this trip