pamukkale travertines pools and terraces. denizli, turkey. natural site of hot springs and travertines, terraces of carbonate

attraction background balcony basin bath blue calcium carbonate castle chalk cotton denizli destinations famous geological geology heritage hierapolis hot landmark landscape mineral minerals natural nature outdoor pamukkale pool pools reserve rock scenic sightseeing sink site sky spring springs stalactite summer terrace terraces texture thermal tourism tourist transparent travel travertine travertines turkey turkish turquoise unesco water waterfall white