Mount Rushmore is a sculptural monument carved between 1927 and 1941 on a granite mountain in South Dakota (United States) that features the 18-meter-high faces of American presidents George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln. The most interesting thing about it is that it has a secret chamber where several historical documents are kept such as: the Declaration of Independence, the Constitution and the Bill of Rights. In addition, you can also find the biography of Gutzon Borglum, the sculptor of the monument. This camera is closed to the public.