Mammoth Cave National Park, National park in Kentucky, USA.
Mammoth Cave National Park is home to the world's longest known cave system.
The park was established in July 1941 to preserve the Mammoth Cave system.
Native American artifacts found within the caves mark the early human cultural history.
Visitors can explore the cave through a variety of ranger-led tours.
With over 400 miles of passageways, its vast network of underground caverns is yet to be completely explored.
Location: Edmonson County
Location: Hart County
Location: Barren County
Inception: July 1, 1941
Website: nps.gov/maca/index.htm
Sources: Wikimedia, OpenStreetMap