Each President

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If you are thinking that the completion of all the faces took place in one go, then my friend you are wrong. The first face that is of George Washington was completed in 1934 and it was during 1936 by which Thomas Jefferson face was finished. After Jefferson, it was Abraham Lincoln’s face that was finished up by the year 1937 and at last Theodore Roosevelt’s face was completed in 1939.
As the completion was going on there was another thing that was also getting completed. Gutzon Borglum was working on a secret project and he was waiting for the project to get finished as he wanted to add this secret project of his at the end so that no one can know about the mystery he was working on all these years.