WASHINGTON, DC - MARCH 18:  Prince Charles, Prince of Wales visits the National Archives to view the 1297 Magna Carta and Charters of Freedom to mark the 800th Anniversary of Magna Carta and its impact on the development of the United States Constitution on the second day of a visit to the United States on March 18, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States.  (Photo by Arthur Edwards - Pool / Getty Images)