Pamukkale, Turkey - Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water.
The thermal pools of Hierapolis: think taking a bath in an ancient pool, in sparkling water (yes, sparkling!), sitting on a piece of fallen column that was standing there in times you've studied in history books. Just amazing.