Perhaps one of the most iconic monuments in the USA, Mount Rushmore National Memorial depicts heads of Presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln carved into the granite face of Mount Rushmore in the Black Hills in Keystone, South Dakota. It is reported to attract more than two million visitors annually. Historian Doane Robinson wanted to promote tourism in South Dakota so he came up with an idea for a memorial and persuaded sculptor Gutzon Borglum to model the sculptures. After the project was approved by Congress, the carving started in 1927 and ended in 1941 without a single fatality.