Cotton Castle, Pamukkale's translated name, is a wildly popular tourist site. Seventeen hot-water springs in the area spill out water in temperatures ranging from 95 degrees to 212 degrees, which contains a high concentration of calcium bicarbonate. The water flows off a cliff, cools and hardens into calcium deposits that form terraces. These terraces are as white as cotton and bright enough to be easily seen from the town of Denizli, which is on the opposite side of the valley, 19 kilometres away. The terraces, which continue to grow, hold pools of water. Soakers are welcome; shoes are not, to protect the deposits.
* Bing: Top hot springs destinations