This site is exceptional by vurtue of its superlative natural phenomena – warm, heavily mineralized water flowing from springs creating pools and terraces which are visually stunning. It is on this outstanding natural site that Hierapolis, an exceptional example of a Graeco-Roman thermal installation, was established. The Christian monuments of Hierapolis constitute an outstanding example of an early Christian architectural complex.Pamukkale, which literally means ‘cotton castle’, is the name the Turks gave to the extraordinary site of Hierapolis. The name was inspired by the preternatural landscape of bizarre forms created by calcite deposits from the hot springs that surface through a fault: mineral forests, petrified cascades and terraced pools of an immense natural nymphaeum. The ancients attributing healing powers to the hot springs (35 °C) equal to their power to metamorphose the landscape, they founded a thermal station on the site in the late 2nd century. The history of Hierapolis followed the same course as many Hellenistic cities in Asia Minor. The Romans acquired full control of it in 129 BC and it prospered under its new rulers. It was a cosmopolitan city where Anatolians, Graeco-Macedonians, Romans and Jews intermingled. The hot springs which attracted throngs of people ‘taking the waters’ also served another purpose: scouring and dying wool.
The therapeutic virtues of the waters were exploited at the various thermal installations which included immense hot basins and pools for swimming. Hydrotherapy was accompanied by religious practices, which were developed in relation to local cults. The Temple of Apollo was erected on a fault from which noxious vapours escaped. The theatre, which dates from the time of Severus, is decorated with an admirable frieze depicting a ritual procession and a sacrifice to the Ephesian Artemis. The necropolis affords a vast panorama of the funerary practices of the Graeco-Roman epoch. According to ancient tradition, Philip the Apostle converted it and was crucified there by Domitian around the year 87. Hieropolis remained one of the two metropolises of the Phrygia Pacatiana as well as being a bishopric. The group of Christian buildings are the cathedral, baptistry and churches. The most important monument is the martyrium of St Philip. At the top of a monumental stairway, the octagonal layout of the building is remarkable because of its ingenious spatial organization. The fortress, built on the cliff, testifies to its ultimate historic phase.
The Pamukkale National Park is the focal point for the natural values of the site, formed by its highest travertine terraces, with 20 m high cliffs and waterfalls. The stunning white calcium pools, which cling to the side of a ridge, have long been one of the most famous picture postcard views of Turkey. Pamukkale, literally meaning “cotton castle”, is also the site of the ancient city of Hierapolis. Pamukkale was formed when a spring with a high content of dissolved calcium bicarbonate cascaded over the edge of the cliff, which cooled and hardened leaving calcium deposits. This formed into natural pools, shelves and ridges, which tourists could plunge and splash in the warm water.