Yerebatan Cistern

The Basilica Cistern (Turkish: Yerebatan Sarayı - "Sunken Palace", or Yerebatan Sarnıcı - "Sunken Cistern"), is the largest of several hundred ancient cisterns that lie beneath the city of Constantinople, Turkey. The cistern, located 500 feet (150 m) southwest of the Hagia Sophia, was built in the 6th century during the reign of Byzantine Emperor Justinian I.

Source

 * Assassin's Creed: Revelations soundtrack - Disc one, track 23. Yerebatan Cistern