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Pamukkale - translated means "cotton castle" - is a result of earthquake activity that gave rise to the emergence of hot springs.

Apart from some radioactive material, the water contains large amounts of hydrogen carbonate and calcium, which leads to the precipitation of calcium bi-carbonate. Every second 250 liters of hot water arises from this spring, precipitating 2.20 grams of chalk per liter of water or 0.55 kilograms of chalk every second. In the course of time some sources dried up because of earthquakes, while new ones arose in the neighbourhood.

The effect of this natural phenomenon has left thick white layers of limestone and travertine cascading down the mountain slope resembling a frozen waterfall. One type of these formations consists of crescent-shaped travertine terraces with a shallow layer of water, lying in a step-like arrangement down the upper one-third of the slope, with the steps ranging from 1m to 6 meters in height. The other form consists of stalactites, propping up and connecting these terraces.

source: Wikipedia