- The geological history of Missouri lives on within these enormous caverns, which contain more than 6,000 known caves spread throughout 26 miles of underground territory. During the Civil War, Union forces used the caves for gunpowder production. Jesse James was among the Confederate raiders who blew up the operation. After the war, he and his gang used the caves as a hideout. Today, the cave is a family attraction with a gift shop, restaurant and museum. Guided tours leave at 20-30 minute intervals.
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