Europe

Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli Province in southwestern Turkey. The city contains hot springs and travertines, terraces of carbonate minerals left by the flowing water. http://www.mygola.com/cotton-castle-p49183

Hierapolis was established by King Eumenes 2 and was given the name of "Hiera" in the honour of the wife of Telephos, the legendary establisher of the ancient Pergamum. http://www.mygola.com/hierapolis-p11350

Pamukkale is an amazing display of natural hot water pools in Denizli Province, south-western Turkey. What you see in the photos below are known as travertines or the terraces that form due to the carbonate minerals that gather up as the flowing water circles. http://www.mygola.com/pamukkale-hot-springs-p62990