Just outside Bridgeport in the Eastern Sierra, Travertine is a collection of rustic pools overlooking snow-capped mountains and high desert –and bags the top spot on this list. The springs are free to access, down a rough dirt road that can become impassable in winter.

Natural rock basins have been enhanced with stonework and pipes to help regulate temperature, and clothing is optional, but the site has no facilities, so come prepared to pack out garbage and avoid peak hours. Sunrise and sunset soaks are especially scenic.

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The best US hot springs you can actually soak in, ranked