6. Los Tres Ojos

Los Tres Ojos, or "The Three Eyes," is actually four subterranean lakes (the fourth was only discovered in 1948) fed by an underground river called Brujuelas. The lakes can be found in caverns just off a small beach, and visitors love to wander amid the picturesque formations. Each lake has unique characteristics, and water temperatures range from balmy to a chilly 59° Fahrenheit, and depths range from 10 feet to over 900 feet.   (© 10Best)

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