Worldly famous Pamukkale, also called ‘cotton castle’, is located at the southern banks of the Hierapolis Ancient City in Turkey. Since thousand of years, the water got colder and solid as it got farer from the calcareous hot water source and formed the travertine terraces in the shape of floors and steps. There is “radon gas” in Pamukkale Travertine and this gas has a relaxing effect for people. Besides being a unique natural phenomenon, Pamukkale Travertine can be used for healing purposes as hot springs.