Mammoth Cave National Park protects the longest known cave system on Earth, with hundreds of miles of surveyed passages beneath central Kentucky. Ranger-led tours range from enormous historic corridors to tight stair-filled cave routes, while the park above ground remains open without an entrance fee.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
Something wrong with this entry?
Source: nps.gov/maca/