His Royal Highness, Prince Charles, right, and Duchess of Cornwall, Camilla, step out of George Washington’s mansion at Mount Vernon, Va., toward the Potomac River during their visit to Washington, March 18, 2015. Prince Charles previously visited Mount Vernon in 1970 with his sister Princess Anne, and two of U.S. President Richard Nixon’s daughters. (Joint Base Myer-Henderson Hall PAO photo by Rachel Larue)