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Mammoth Cave, United States - This is the world's longest known cave system, with more than 400 miles explored so far

Mammoth Cave, Kentucky. By far, the world's longest known cave system, encompassing over 390 miles of passageways.

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Mammoth Cave National Park

Mammoth Cave NP, Kentucky - This national park protects the longest cave system in the world. It was one of the first national parks I went to. We must have stopped on our drive to Florida to visit my cousins. I wore a white sweatshirt and got rust on it by covering my hands with my sleeves when I grabbed onto the handrails. That's all I really remember. My parents took us to a lot of caves when we were younger. I'm glad they got it over with because I'm not so keen on going down into…

Travel + Leisurefrom Travel + Leisure

Mammoth Cave

Mammoth Cave Cave City, Kentucky

Mammoth Caves Natl. Park, Kentucky - I happened to go on a day that there weren't many others. Just me and about 30 monks on a tour!

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Appalachian Trail

Smokey Mountain National Park

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Grand Canyon National Park (South Rim)

Went with my wife on our honeymoon . Bucket list !