Have you ever been to Mammoth Cave? WOW! Just wow! This national park stretches over 53,000 acres with over 400 miles of caves and caverns. This cave system is massive, with no shortage of trails to explore, caverns to marvel at, and geology to step into. These caves have hundreds of years worth of archaeology discoveries showing it being used as a home, a military garrison, a make shift medical treatment facility, and a criminal hideout over those years. Now tour guides lead travelers through the maze of intricate tunnels and caves. There are different tours available based on length and ability level. But no matter what you tour you take, you will be absolutely amazed at what you see there.
For more info on Mammoth Cave National Park, check out https://www.nps.gov/maca/index.htm