Kentucky·United States
Photo: James St. John · Wikimedia Commons (CC BY 2.0)
Mammoth Cave's limestone passages run for over 680 km, far longer than any other known cave, and new sections are still being mapped. The national park offers everything from the historic tour past 1800s saltpetre works to the Wild Cave Tour, six hours of crawling and squeezing off the tourist trails.
In season: Year-round · Peak: Year-round
Ranger-led tours only, from easy walks through huge passages to tight belly crawls on the wild tours. The cave stays around 12 degrees all year.
The route walked since the 1800s, saltpetre works and all
Four miles through the deep passages
Six hours crawling in the longest cave system on earth
Book tours on the park's reservation site, especially in summer. Take the Historic Tour first, then the Grand Avenue tour, and join the Wild Cave Tour if you are fit and happy in tight spaces.
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