Visit the 3rd Dakota

If your summer vacation this year takes you to Yellowstone National Park, you might take a side trip to one of America's oddest geographic anomalies: Lost Dakota. Nobody lives there now... and there aren't even any signs or maps to help you get there. But in the corner of Yellowstone--where Montana, Idaho and Wyoming meet, there was a little patch of Dakota. Lost Dakota gets the full treatment in the book , watch the video above for a quick overview.