Sand Cave

Famous cave explorer Floyd Collins died inside here February 13, 1925 and is buried nearby. While exploring alone, he knocked a rock loose that pinned him in a tight passage. While he was found by friends and family the next day alive, there was a cave-in a few days later that cutoff rescuers from him. See http://en.wikipedia.org/wiki/Floyd_Collins for more of the story. I have actually seen the movie inspired by this, Ace in the Hole, with Kirk Douglas.