Digging deeper into South Dakota attractions, we visit a five-story waterfall and the Queen Bee Mill in Sioux Falls. Next we travel to see the (unfinished) Crazy Horse Memorial in the Black Hills mountain range. Then we search for the secret Hall of Records behind Mount Rushmore that was mentioned in the 2004 film National Treasure: Book of Secrets. 

*Hall of Records is not open to the public for safety reasons.