WASHINGTON, DC - MARCH 18: Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales visit George Washington's tomb, and are invited to lay a wreath 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)

WASHINGTON, DC - MARCH 18:  Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales visit George Washington's tomb, and are invited to lay a wreath 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)