Magnificent architecture!! They call it the "The Sunken Cistern". Built in 6th century during the reign of Byzantine Emperor Justinian.
The Basilica Cistern is the largest of several hundred ancient cisterns...read more
The Basilica Cistern is the largest of several hundred ancient cisterns beneath the city that provided a water filtration system for the buildings nearby. This underground chamber measures approximately 138 meters (453 ft) by 64.6 meters (212 ft) and is capable of holding 80,000 cubic meters (2,800,000 cu ft) of water. The ceiling is supported by 336 marble columns.