This alien-looking rock formation is 1,267 feet tall, and was fittingly the site of alien thriller "Close Encounters of the Third Kind."
While super remote, it's a great side-trip if you're on a road trip to Mount Rushmore. Because it's so far off the beaten path, there's plenty of room for camping. Even better, there are nightly screenings of the movie — extra special considering you're in the shadow of the famous natural monolith.