Mammoth Cave National Park, Kentucky - A group tours the Frozen Niagara section of Mammoth Cave.

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Mammoth Cave National Park, Kentucky - A group tours the Frozen Niagara section of Mammoth Cave, the longest known cave system in the world.

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Size: 3555px × 2369px
Location: Mammoth Cave National Park, Kentucky USA
Photo credit: © Jim West / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: america, cave, cavern, flowstone, frozen, group, horizontal, kentucky, mammoth, national, niagara, park, south, speleothem, states, tour, tourism, travel, underground, united, usa