Mammoth Cave National Park

National park in Kentucky, United States

Mammoth Cave National Park is a national park of the United States in south-central Kentucky. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,007 acres (21,046 ha) are located primarily in Edmonson County, with small areas extending eastward into Hart and Barren counties.

From Wikipedia, under CC BY-SA. More on occurri.