Some say the word “spa” is an acronym for the Latin phrase Sanus Per Aquam, meaning “healing through water.” Others say it came from the springs of Spa, Belgium, around which a famous health resort grew. Or could it be from the Walloon (a French dialect spoken in parts of Belgium) word for “fountain?”
Whatever. We love the feeling of mineral-rich hot springs water in outdoor pools, especially after a day of hiking. The combo of calcium, magnesium, sodium, iron, and other dissolved minerals has soothed many an aching muscle–and, some folks claim, provided miraculous cures. The western US is rich in hot springs, ranging from humble holes out in the woods to water channeled into manmade pools at luxe resorts. Here are some of the loveliest springs where you can stay overnight in comfort while taking the healing waters. Or ask about a day pass.