Basilica Cistern

The Basilica Cistern (Yerebatan Sarnıcı), also known as the “Sunken Palace,” stands as one of Istanbul’s most extraordinary and mysterious underground marvels. Built in the 6th century during the reign of Byzantine Emperor Justinian I, this magnificent subterranean water reservoir is the largest of several hundred ancient cisterns that lie beneath Istanbul, representing a masterpiece of Byzantine engineering that has captivated visitors for decades.

Spanning nearly 10,000 square meters with the capacity to hold 80,000 cubic meters of water, the cistern is supported by a forest of 336 marble columns arranged in 12 rows of 28 columns each. These towering columns, each approximately 9 meters high, were salvaged from ancient Greek and Roman temples and buildings across the empire, creating a unique archaeological tapestry where Corinthian, Ionic, and Doric capitals tell stories of civilizations past.

The cistern’s most enigmatic and photographed features are the two legendary Medusa heads positioned as column bases in the northwest corner. These carved marble blocks, with their origins shrouded in mystery, are positioned one upside down and one on its side, creating an atmosphere of ancient mystique that has inspired countless legends and theories about their protective or symbolic significance.

Originally called “Basilica” because it was located under the Stoa Basilica, a large public square on the First Hill of Constantinople, this underground wonder served as the primary water supply for the Great Palace and surrounding Byzantine structures. After centuries of abandonment during Ottoman times, the cistern was rediscovered and transformed into a museum, where today’s visitors can walk along elevated walkways through dimly lit chambers that echo with the whispers of Byzantine history.

The cistern’s atmospheric beauty, enhanced by dramatic lighting and the gentle sounds of dripping water, creates an almost otherworldly experience that transports visitors back 1,500 years to the height of the Byzantine Empire.