There’s a secret room behind Mount Rushmore that is inaccessible to tourists

• Mount Rushmore has a hidden room that’s closed to the public.
• Gutzon Borglum, the sculptor behind the monument, was worried that over time his work would lose significance.
• He proposed a secret room behind Abraham Lincoln’s hairline that would contain details of the work done on the mountain and of the society that created it.

EDITOR’S NOTE: This video was originally published on January 31, 2017.