Hierapolis. Pamukkale. Turkey. View of the façade of the large latrine toilet on the paved and colonnaded Frontinus Street beside the Arch of Domitian at the Hierapolis. The latrine has two channels inside, one for human waste sewage and one for fresh water, missing are the stone slabs that served as toilet seats. Hierapolis was founded as a Hellenistic thermal spa city above the Pamukkale plateau in 190 BC by Eumenes II, King of Pergamum. The ancient city passed into the hands of the Romans where it grew and prospered especially during the second and third centuries AD. Most of the archaeological monuments at Hierapolis date from this period. Hierapolis-Pamukkale together are a Unesco World Heritage Site.