Pamukkale, meaning "cotton castle" in Turkish, is a natural site in Denizli in southwestern Turkey. The area is famous for the carbonate mineral left by the flowing water. 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, and motor bikes were allowed to go up and down the slopes. When the area was declared a World Heritage Site, the hotels were demolished, and the road removed and replaced with artificial pools. Pamukkale is situated in Turkey's Inner Aegean region which is a place full of birdlife.