These 7 Natural Pools are the World's Best-Kept Secrets
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Hierve el Agua
Oaxaca's petrified mineral waterfalls look like tumbling white water frozen in time. The stunning phenomenon has formed thanks to calcium-rich water, which drips down the mountain and through underground caves. While much of the waterfall-like formation is an optical illusion, travelers can bathe in the warm thermal pools at the top of the cliff.
Insider tip: Hierve el Agua can get crowded during the day in high season, so opt to hire a driver and head to the attraction in the morning to have the stunning scenery to yourself.
Photo by Arturo Barreda Westphal