AnirudhaGutzon Borglum’s Secret Addition
As the project was falling behind due to the funding shortage, the then United States government authorized Gutzon Borglum’s addition on which he was working. So, in the years 1938 and 1939, a 70-foot tunnel that went behind Abraham Lincoln’s head was added after the project ended. This tunnel which Borglum explained, would work as the entrance for “The Hall of Records at Mount Rushmore.”