Pamukkale itself (or at least the tourist stop we made there) was amazing. We saw the white travertine pools, formed by calcium carbonate deposits from the natural warm springs, and the adjacent ancient city of Hierapalis and its necropolis. 'Pamukkale' means 'cotton castle,' and the name comes from the appearance of the natural pools.
Most of the pools are closed now but people used to be able to swim in them. Now, they just let you walk barefoot in some on the upper level. At the back of the area, there is a covered area where you can eat, but the most interesting part is that you can swim in the warm pools there. At the bottom of them are old columns and ruins, but the water is crystal clear.
More info on Hierapolis:http://en.wikipedia.org/wiki/HierapolisClick here for a satellite view of the travertine formations. The Hierapolis theater is visible just east of the white area.
This entry includes some photos taken on the way to Pamukkale (pronounced 'pa-MOOK-KA-le,' again sounding vaguely Hawaiian). Our lunch stop was at a little road-side restaurant attached to a gas station, and there was marble and granite everywhere! Even the rest rooms had granite sinks and marble tile.