“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 Istanbul, Turkey. The cistern, located 500 feet (150 m) southwest of the Hagia Sophia on the historical peninsula of Sarayburnu, was built in the 6th century during the reign of Byzantine Emperor Justinian I.”
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Hagia Sophia is the one of the most visited museums and most prominent monuments in the world in terms of art and the history of architecture. It has also been called “the eighth wonder of the world” by East Roman Philon as far back as the 6th century. It was used as a church for 916 years but, following the conquest of Istanbul by Fatih Sultan Mehmed, the Hagia Sophia was converted into mosque. Afterwards, it was used as a mosque for 482 years.