Cistern of Theodosius
There of dozens of Byzantine era cisterns located throughout Istanbul’s ancient city’s foundations but the largest and most notable is the Basilica Cistern which was closed at the onset of the pandemic and remains closed for extensive renovations until an undesignated future date. The most notable of the other cisterns is the Cistern of Theodosius which remains open to the public as a museum.
Here it is on the map
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