Security glass advertisement – filled with cash. There was a security guard close by in case of someone doing something dramatic, like attempting to run over entire display with a large vehicle.
Secret tunnel – Mt. Rushmore’s Hall of Records – This entrance to the hall in the canyon behind the presidents’ heads was carved in 1938 by the original designer of Mt. Rushmore, Gutzon Borglum. However, the project was halted in 1941 when Borglum...
