16 Mindblowing Pictures of the Underground River in Mexico
July 10th, 2013 | by Amazing Traveler
The underground river is actually a thin layer of hydrogen sulfate, which separates the fresh and salt water, and the…
July 10th, 2013 | by Amazing Traveler
The underground river is actually a thin layer of hydrogen sulfate, which separates the fresh and salt water, and the…
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