Pamukkale, meaning “cotton castle” in Turkish, is a natural site in Denizli in southwestern Turkey. The area is famous for a carbonate mineral left by the flowing water. The shimmering, snow-white limestone, have been shaped over millennia by calcium-rich springs. Dripping slowly down the vast mountainside, mineral-rich waters foam and collect in terraces, spilling over cascades of stalactites into milky pools below.
Tourism is and has been a major industry in the area for thousands of years, due to the attraction of the thermal pools. As recently as the mid-20th century, hotels were built over the ruins of Hierapolis, causing considerable damage. An approach road was built from the valley over the terraces. The terraces are all currently off-limits, having suffered erosion and water pollution at the feet of tourists.
The ancient Greco-Roman city of Hierapolis was built on top of the white “castle” which is in total about 2,700 meters long, 600 m wide.