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General Grant National Memorial. The monument in Manhattans Riverside Park recognizes Grants military career. It had an average of 101,832 annual visitors between 2008-2012. (Photo courtesy of National Park Service)
General Grant National Memorial. The monument in Manhattan's Riverside Park recognizes Grant's military career. It had an average of 101,832 annual visitors between 2008-2012. (Photo courtesy of National Park Service)
Lyndon Baines Johnson Memorial Grove on the Potomac. The grove, which attracts 317,069 average annual visits (2008-2012), includes a 43-ton granite block surrounded by various tree-shaded trails to honor the 36th president and his wife. The memorial is near the Pentagon and Arlington Memorial Cemetery.(Photo courtesy of National Park Service)
Lyndon Baines Johnson Memorial Grove on the Potomac. The grove, which attracts 317,069 average annual visits (2008-2012), includes a 43-ton granite block surrounded by various tree-shaded trails to honor the 36th president and his wife. The memorial is near the Pentagon and Arlington Memorial Cemetery.(Photo courtesy of National Park Service)
Washington Monument. Even though the monument to the countrys first president has been closed for more than a year to repair earthquake damage, it still attracted 481,170 average annual visitors from 2008 to 2012. (Photo by Bill IngallsNASA via Getty Images)
Washington Monument. Even though the monument to the country's first president has been closed for more than a year to repair earthquake damage, it still attracted 481,170 average annual visitors from 2008 to 2012. (Photo by Bill Ingalls/NASA via Getty Images)
Mount Rushmore National Memorial. The monument in Keystone, N.D., features the faces of Washington, Roosevelt, Lincoln and Jefferson and took 400 workers 14 years to build. It brought 2,129,585 average annual visitors from 2008 to 2012.
Mount Rushmore National Memorial. The monument in Keystone, N.D., features the faces of Washington, Roosevelt, Lincoln and Jefferson and took 400 workers 14 years to build. It brought 2,129,585 average annual visitors from 2008 to 2012.
Thomas Jefferson Memorial. An average of 2,313,163 visited the memorial annually between 2008 and 2012. The memorial is on the southern edge of the Tidal Basin with views toward many of the other presidential sites (Photo by Alex WongGetty Images)
Thomas Jefferson Memorial. An average of 2,313,163 visited the memorial annually between 2008 and 2012. The memorial is on the southern edge of the Tidal Basin with views toward many of the other presidential sites (Photo by Alex Wong/Getty Images)
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Franklin Delano Roosevelt Memorial. The National Organization on Disability raised 1.65 million privately to add the once-controversial and now-famous sculpture of Roosevelt in his wheelchair. An average of 2.5 million people visited the monument annually between 2008 and 2012. (Photo by Mark WilsonGetty Images)
Franklin Delano Roosevelt Memorial. The National Organization on Disability raised $1.65 million privately to add the once-controversial and now-famous sculpture of Roosevelt in his wheelchair. An average of 2.5 million people visited the monument annually between 2008 and 2012. (Photo by Mark Wilson/Getty Images)
Lincoln Memorial. The monument to the 16th president of the United States has a statue of Abraham Lincoln that is 19 feet high and weighs 120 tons. Between 2008 and 2012, the monument had 5,627,865 average annual visitors. (AP PhotoJon Elswick, File)
Lincoln Memorial. The monument to the 16th president of the United States has a statue of Abraham Lincoln that is 19 feet high and weighs 120 tons. Between 2008 and 2012, the monument had 5,627,865 average annual visitors. (AP Photo/Jon Elswick, File)
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