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Upside down; inverted; head; medusa; stone; pedestal; carving; Basilica Cistern; Turkey; reused; marble; columns; pillars; Yerebatan Sarayı; Sunken Palace; Yerebatan Sarnıcı; Istanbul; Constantinople; underground; cathedral; ceiling; roof; chamber; cistern; water; filtration; storage; reservoir; rebuilt; Stoa; Basilica; Justinian; 532; Sultanahmet; red; lights; cathedral roof; cavern; reflection; travel; tourism; historic; artifact; Byzantine