Istanbul counts 60 cisterns. All of them were built during Byzantine times. The Yerebatan or Sunken Palace is the last surviving Byzantine cistern in Istanbul. It was a enormous water storage tank that dates back from the 532. 336 columns support the underground water tank that could once hold 80.000 cubic water. It was all pumped and delivered through a 20 km long aqueduct. The tank was used until the 16th century. Nowadays it is open to the public. Walk inside, stroll through this mysterious place. Pick up an audiobook to learn more about it. Find it right in the city centre next to Aya Sofya.
Alemdar Mh., Yerebatan Cd. 1/3, 34410 Fatih/İstanbul, Turkey