Often lauded as one of the best-kept secrets on the Yucatan Peninsula, Río Secreto (or Secret River) is an underground river ... Chichen Itza, Cenote, and Valladolid Tour ...

Here are 19 of the best adventures you can have while you’re in Cancun. You may need to make a return trip to fit them all ...

It features stalactites and stalagmites as well as cenotes with mirror ... For additional underground fun, opt for a tour of the cave's river, where you can swim and snorkel in the crystalline ...

The mystery only deepened when Italian researchers claimed to have discovered a 'vast underground city' from giant vertical ...

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