Pamukkale [Turkey] Pamukkale means cotton castle, and has also been called the white castle because

Pamukkale [Turkey] Pamukkale means cotton castle, and has also been called the white castle because of the vast whiteness caused by the high concentration of calcite in the water. Travertine sedimentary deposits have created the white terraces, petrified waterfalls and mineral forests that make up the landscape. The 17 hot springs are heated by an underground volcano. The beautiful area of Pamukkale, Turkey, has been used as a healing spa for thousands of years. -- source link

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