Permukkale - The Wonderful Land

Pamukkale is a town in western Turkey known for the mineral-rich thermal waters flowing down white travertine terraces on a nearby hillside. It neighbors Hierapolis, an ancient Roman spa city founded around 190 B.C. 

Ruins there include a well-preserved theater and a necropolis with sarcophagi that stretch for 2km. The Antique Pool is famous for its submerged Roman columns, the result of an earthquake.
The ancient Greco-Roman city of Hierapolis was built on top of the white "castle" which is in total about 2,700 metres (8,860 ft) long, 600 m (1,970 ft) wide and 160 m (525 ft) high. 

 It can be seen from the hills on the opposite side of the valley in the town of Denizli, 20 km away.
Tourism is and has been a major industry in the area for thousands of years, due to the attraction of the thermal pools. 

Pamukkale’s well-preserved Roman ruins and museum have been remarkably underestimated and unadvertised; tourist brochures over the past 20 years have mainly featured photos of people bathing in the calcium pools. Aside from a small footpath running up the mountain face, the terraces are all currently off-limits, having suffered erosion and water pollution at the feet of tourists.

Sources: Wikipedia & Google Images