This ancient spa city's location atop Pamukkale's tourist-magnet travertines is quite spectacular. Founded as a curative centre around 190 BC by Eumenes II of Pergamum, it prospered under both the Romans and Byzantines, when large Jewish and Orthodox Christian communities comprised most of the population. Recurrent earthquakes brought disaster, and Hierapolis was finally abandoned after an AD 1334 tremor. When visiting, don't miss the Roman Theatre, the agora and the on-site museum. From mid-October to March, last tickets are 5pm.