Yerebatan Sarayi (Basilica Cistern or Underground Palace) ; Istanbul was one of the most often besieged cities in the world and has always needed permanent water supplies. As a result, many underground cisterns were built during the Byzantine Empire. Water was brought to these big reservoirs from far away sources through aqueducts. The largest and most ornate of these cisterns is Yerebatan Sarayi. In its construction, columns and capitals of earlier temples were used and this provides a very decorative appearance.
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