When we think of the word “spa,关键字2” many of us picture fluffy robes, massage therapists, and rooms soundtracked with pan flutes and gentle strings. But the earliest spas sprung from the natural world. Rather than being housed in buildings, they bubbled up from the earth, offering soothing, naturally heated springs. The natural splendor of some of these hot springs and soaking pools remains untouched today. Not only do these natural spas provide some of the greatest spots for relaxing across the globe, they offer breathtaking views, far from the distracting buzz of the modern world.

In Iceland, you can bathe in a geothermal pool which was long ago visited, legend goes, by the strongest Viking in the land. Or head to Mexico, where natural sinkholes called cenotes are strung with vines and filled with sapphire-blue water. While a visit to these spots will make you feel connected with the people who have been swimming in them for thousands of years, some have a more direct tie to history, like the soothing lagoon at the foot of a Spanish waterfall, close to a site of Paleolithic artifacts. Whether you’re in it for the history, or just a relaxing afternoon, these six soothing spots have you covered. Just don’t forget to pack a towel.