Yellowstone National Park, Wyoming, Montana, and Idaho
PHOTO:VINCE FERGUS/TRAVEL + LEISURE
After safely viewing the thermal basins and geysers, experience Yellowstone's geothermal waters for yourself. You cannot soak in the park's hot springs, as they can be very dangerous, but you can usually swim in the Boiling River in a designated swimming and soaking area. At nearby Yellowstone Hot Springs, just a short drive from Yellowstone National Park, you'll find pools filled with warm mineral water.
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Castle Hot Springs, Arizona
This dreamy resort is the ideal destination for travelers looking for a luxurious hot springs experience. Secluded pools are located within the beautiful desert landscape, offering a unique soaking experience; and an inclusive stay here comes with farm-to-table meals, access to the springs, and activities like guided hikes and farm tours.