The Pamukkale Travertines, with their hilltop location overlooking Denizli, along with their unique color and shape, truly resemble a castle made of cotton. They are listed as a UNESCO World Heritage Site. The thermal spring waters that form the source of the Pamukkale Travertines are considered a natural remedy for various ailments, including rheumatism, skin conditions, heart and respiratory issues, as well as circulatory and digestive disorders.