One of the magnificent ancient buildings of İstanbul is the Basilica Cistern located in the southwest of Hagia Sofia. Constructed for Justinianus I, the Byzantium Emperor (527-565), this big underground water reservoir is called as “Yerebatan Cistern” among the public because of the underground marble columns. As there used to be a basilica in the place of the cistern, it is also called Basilica Cistern.
Except couple of the edged and grooved columns of the cistern, majority of them are shaped as a cylinder. Two Medusa heads, which are used as supports under the two columns at the northwest edge of the cistern, are the great work of art from the Roman period. What attracts most attention from the visitors is that the structure from which the Medusa heads have been taken is unknown. The researchers often consider that it has been brought for being used as supports to the column at the time of construction of the cistern. However, this has not prevented myths for the heads of Medusa.
The museum is open to visits seven days a week. Exceptionally, it opens at 13:00 on first days of religious holidays and on January 1.
• The museum is open to visits between 09:00 and 17:30(winter) every day.
• The museum is open to visits between 09:00 and 18:30(summer) every day.