Laodicea on the Lycus was an ancient city built on the river Lycus. It was located in the Hellenistic regions of Caria and Lydia, which later became the Roman Province of Phrygia Pacatiana. It contained one of the Seven Churches of Asia mentioned in the Book of Revelation. Its many buildings include a stadium, baths, temples, a gymnasium, theatres, and a bouleuterion.

Hierapolis was an ancient Greek city located on hot springs in classical Phrygia. Its ruins are adjacent to modern Pamukkale in Turkey and currently comprise an archaeological museum and is a UNESCO World Heritage Site. The site has the Tomb of Philip the Apostle. The hot springs have been used as a spa since the 2nd century BC, with many patrons retiring or dying there. The large necropolis is filled with sarcophagi, most famously that of Marcus Aurelius Ammianos, which bears a relief depicting the earliest known example of a crank and rod mechanism.

Antique Pool remains from Roman times when it was the spiritual center of the spa city of Hierapolis. The modernized pool is the prime public place for a swim at this hot-springs resort. The temperature of the water is comfortably and pleasurably warm, not hot.

Natural Park is a natural hot pool and a UNESCO World Heritage Site. It is known for the mineral-rich thermal waters flowing down white travertine terraces on a nearby hillside. Dripping slowly down the mountainside, mineral-rich waters collect in and cascade down the mineral terraces, into pools below.

Red Water or Karahayıt Thermal Spa is five km away from Denizli. The water comes from the travertines and is red in colour so visitors can enjoy seeing the red travertines-calcium oxide formations. Due to the minerals existing in its structure, the hot spring water spreads reddish colour to the environment and it is believed that they provide healing to the visitors for 5000 years.