Travel + Leisure on MSN
This national park has the longest-known cave system in the world—with over 400 miles of passages and a frozen waterfall
Along with underground adventures, Mammoth Cave National Park in Kentucky offers great hiking and kayaking, too.
The Kentucky Down Under Adventure Zoo is located just off Interstate 65 in Horse Cave, Kentucky. Guests can enjoy an array of animal exhibits and a 30-minute tour of the Mammoth Onyx Cave for the ...
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