Mammoth Cave National Park in Kentucky by admin September 19, 2022 Mammoth Cave National Park in Kentucky, United States is a United Nations World Heritage Site. Spanning across an area of 52,830 acres (21,380 hectares), it is the world’s longest known… Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)