Hot Springs State Park, Thermopolis, Wyoming
Named Thermopolis ("hot city" in ancient Greek) for its many natural hot springs, this town is home to Hot Springs State Park. Visitors can soak in the public bathhouse's 104-degree waters for free. Keep an eye out for bison, and be sure to check out the petroglyphs at Legend Rock while you're there.
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Travertine Hot Springs, Bridgeport, California
Take in views of the Sierras while soaking in the natural Travertine Hot Springs near Bridgeport, California. Located on California State Park land off of Route 395, these small, rustic pools are the perfect stop after a day of hiking.