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Basilica Cistern; Turkey; reused; marble; columns; pillars; Yerebatan Sarayı; Sunken Palace; Yerebatan Sarnıcı; Istanbul; Constantinople; underground; chamber; cathedral; ceiling; roof; cistern; water; filtration; storage; reservoir; rebuilt; Stoa; Basilica; Justinian; 532; Sultanahmet; red; lights; cavern; reflection; travel; tourism; tourists; historic; artifact; Byzantine; walkway