Mammoth Cave is the longest cave system in the world with 400 miles of surveyed passages.
The cave’s name refers to the large width and length of the passages. These passages were formed by the flow of the Green River which also carved out huge rooms.
The park was established as a national park on July 1, 1941. The cave has a long and storied history spanning hundreds of years, which you would probably find boring.
Normally Mammoth Cave has 8 guided tours. Because of the China Virus, they have all been cancelled. Now, most of the Cave is closed to the public because of its narrow passages which would cause people to bunch up. The only thing that is open is a self guided tour of about a mile and a half into the cave limited to the wide passages and rooms.
Concluding from trash left behind, archeologists have determined the cave was first explored about 4,000 years ago.
What? A room built inside the cave? Yep, For a while parts of the cave were used to treat tuberculosis patients. It was thought that the air of the cave rendered a cure. They were wrong.
You do have to watch out, you never know what will come out of these million year old caves.