Flint Ridge Cave System | Cave System, Kentucky, USA
Flint Ridge Cave System, complex of caves and underground rivers in west-central Kentucky, U.S. The surveyed areas of the system are entirely within Mammoth Cave National Park. The caverns are interconnected to a great extent, and some of them have been explored. Flint Ridge is a plateau capped by
United States Mount Rushmore National Memorial South Dakota Mammoth Cave National Park Flint Ridge Theodore Roosevelt
Source: britannica.com