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ancient; stone; wall; Hierapolis; ruins; dry; travertine; pools; tourists; thermal; waters; Pamukkale; Turkey; lookout; visitors; Turkish; play; splash; bath; swim; hot spring; water; pool; terraces; calcium carbonate; white; mineral; deposits; precipitate; Pamukkale; Turkey; Cotton Castle; limestone; tourism; travel; sedimentary; rock; spa; oleander; plant