Four heads on the Presidential Hill of the United States?

They are George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln. These four presidents are considered to represent the 150 years of history of the United States. The entire park covers an area of ??1,278 acres (5.17 square kilometers), with the highest elevation being 5,725 feet (1,745 meters). The park is managed by the National Park Service, a branch of the U.S. Department of the Interior, and attracts approximately two million visitors each year.