6Mammoth Cave – Mammoth Cave National Park, Kentucky
Undoubtedly the world’s largest cave system, Mammoth Cave is justifiably named, considering the fact that new discoveries are being made here all the time. Running across a staggering 400 miles, the natural attraction offers visitors the option of choosing from a wide range of guided tours according to ability and difficulty levels. The two most popular cave tours are the Great Onyx Tour and the Historic Tour. Savor the experience of strolling through the caves and witnessing massive temperature variations, in addition to learning more about the fantastic underground cave system.
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