Graham Cave, up in Montgomery County, Missouri, was the first archeological site in the United States to be designated a National Historic Landmark.
Archaeological excavations starting back in 1949 revealed the cave was used by man as far back as 10,000 years ago (or at least almost as long as post-Flood humanity, if you believe in a traditional Biblical timeframe).
It is fascinating to me that people were living in what is now Missouri so long ago.
The cave is a Missouri State Park and sits on 369 acres of public land. Visitors can go to the entrance of the cave and read about its history and about the discoveries made there.
