* Astronomy

The Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore near Keystone, South Dakota, in the United States. 
Between October 4, 1927, and October 31, 1941, Gutzon Borglum and 400 workers sculpted the colossal 18 m high carvings of U.S. presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln to represent the first 150 years of American history. 
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