The only diamond mine in the world where you can keep what you find.

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant granite rocks standing end-to-end like a train of circus elephants.

Curious cave that stays a cool 56 degrees all year long.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Kentucky's anomalous peninsula projecting into the Mississippi River, site of legendary earthquakes and local feuds.