Featuring chalky white travertine terraces brimming with light blue water, Pamukkale in southwestern Turkey looks like the surface of another planet. The thermal pools at Pamukkale, which translates to “cotton castle” in Turkish, lead up to the ancient ruins of Hierapolis, a Roman spa town with gates, a theater, a temple, and a necropolis that you can visit. Wading through the thermal pools and exploring the ruins—both of which have been granted UNESCO World Heritage status—are the most popular things to do in Pamukkale, but you can also soak in the Antique Pool (also known as Cleopatra Pool), visit the Hierapolis Archaeological Museum, and soar over the area in a hot air balloon.