The stunning white calcium pools, which cling to the side of a ridge, have long been one of the most famous picture postcard views of Turkey. Pamukkale, literally meaning “cotton castle”, is also the site of the ancient city of Hierapolis of which there are many interesting ruins, and is a very popular destination for a short visit. Pamukkale was formed when a spring with a high content of dissolved calcium bicarbonate cascaded over the edge of the cliff, which cooled and hardened leaving calcium deposits. This formed into natural pools, shelves and ridges, which tourists could plunge and splash in the warm water. It is declared a World Heritage Site by UNESCO.