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Basilica Cistern, is one of the most impressive buildings in Istanbul. The reservoir was built between 527-565 by the Byzantine Emperor Justinian I. The basilica cistern is 140 meters long and 70 meters wide. It is a giant building that covers a rectangular area. Its total area is 9800 square meters; The water storage capacity is about 100 thousand tons. The reservoir consists of 336 columns, each 9 meters high, descending through a stone staircase of 52 steps. In the reservoir, which is currently used as a museum, many national and international events are organized throughout the year.
