This is a Classical cistern converted into a Byzantine edifice, with layers from the Ottoman and Republican years built on top of that.
Ancient Roman Cistern
Nearby sites
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Khalkoprateia Church
Church of Theotokos Chalkoprateia. -
Theodosian Walls (Constantinople)
Wallsof Constantinople - defensive walls build of stone in 4th-5th centuries -
Constantinople, Basilica Cistern
Water reservoir. The Basilica Cistern, or Cisterna Basilica Βασιλική Κινστέρνα, Yerebatan Sarnıcı or Yerebatan Saray, "Subterranean Cistern" or "Subterranean Palace" -
Constantinople, Milion
Central milestone in the Byzantine road network. Greek: Μίλιον or Μίλλιον, Míllion; Turkish: Milyon taşı