Travel + Leisure on MSN

This National Park Is Home to the Longest Cave in the World—and Only 426 Miles Have Been Explored So Far

Here’s how to plan a trip to Mammoth Cave National Park.
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Near The Ohio River Is An Unbelievable Cave System That's One Of Indiana's Best Natural Wonders

Thanks to a high concentration of limestone beneath the ground, Indiana has caves galore. This is especially true in southern-central Indiana, where there are many clusters of tourist caves ripe for ...