On the hill above the travertine is the ancient city of Heiropolis, where people came to bathe in the springs from about 2 BC. I will devote a few posts to Heiropolis later, as it is a fascinating place.
Pammukale has been declared a world heritage site, by UNESCO, but only after it had been unprotected for years. The authorities have done a lot to restore the place to its former glory and it is well worth a visit - in fact it is absolutely stunning.
This is a view of the natural pools from the top of the travertine.