Known locally as Yerebatan Sarayi (meaning Sunken Palace) or Yerebatan Sarnici (Sunken Cistern), this underground water cistern was the major water reservoir of Constantinople. The water was transported from the Belgrade Forest by the immense Byzantine aqueducts (Valens Aqueducts). You can visit the Underground Cistern either with our One Day in Istanbul or Istanbul Layover Tour.
It was built during the reign of Emperor Constantine in the 4th Century but greatly enlarged by Justinian in 537 AD, and used as water storage for the Great Palace during Byzantine times and for the Topkapi Palace under the Ottomans.
It fell into disuse, but was rediscovered by Frenchman Petrus Gyllius in 1545, who revealed it after investigations he began when he found locals selling very fresh fish in the nearby streets – their houses were located above it and they had sunk wells into it and sometimes caught fish from it.
This eerie and atmospheric setting has attracted thriller writers across the ages. From seeing the Basilica Cistern James Bond rowed across in From Russia With Love (1963) to the exciting climax featuring Robert Langdon in Dan Brown's Inferno (2013), there can't be many locations as historical and unusual as this.
- There are 336 giant columns (mostly Ionic or Corinthian in style) supporting the structure in 12 rows of 28 columns.
- It's estimated that there were more than 80 underground cisterns in Istanbul, but this is the largest and the best excavated.
- This Istanbul underground cistern is the size of a cathedral; it is 143m long and 65m wide and can hold up to 80,000 cubic meters (or 17.5 million gallons) of water.
Upside down Medusa statue at the Underground Cistern of Istanbul
The two mammoth Medusa heads used as plinths in the far corner of the cistern. One Medusa statue sits is on its side while the other is upside down – supposedly to remove her powers. (In Greek mythology, Medusa was a female monster with snakes for hair, and anyone that looked into her eyes was instantly turned to stone.) Their origins are unknown, but thought to be removed from a Roman era building.
Stroll around the raised, uplit walkways and admire the carp swimming lazily in just a couple of feet of water below – the same water that these extreme wakeboarders tried riding.
The Underground Cistern (aka Basilica Cistern) is open everyday between 9am-7pm and the entrance fee of the cistern is 300 TL for foreign visitors.