Yerebatan Cistern Museum

The Basilica Cistern, also known as the "Yerebatan Palace," is a massive underground water reservoir built in the 6th century (532 AD) by the Byzantine Emperor Justinian I to meet the city's water needs. With its impressive architecture consisting of 336 marble columns and mysterious Medusa head pedestals, it now serves as a museum.

Location: Sultanahmet, Fatih, Istanbul.

History:Built in 532 by Byzantine Emperor Justinian I, the building was actively used until the 16th century and was converted into a museum in 1980.