Hierapolis was an ancient Greco-Roman city in Phrygia located on hot springs in southwest Anatolia. Its ruins are adjacent to modern Pamukkale, Turkey. Hierapolis is a UNESCO World Heritage Site. The hot springs there have been used as a spa since the 2nd century BCE, and people came to soothe their ailments, with many of them retiring or dying here. The large necropolis is filled with sarcophagi, including the Sarcophagus of Marcus Aurelius Ammianos.