Arlington National Cemetery, Washington
Established during the American Civil War on the former estate of Confederate General Robert E. Lee's wife Mary Anna, Arlington National Cemetery is the largest national burial ground in the United States, with 624 acres of landscaped grounds. Veterans and Military casualties from each of the nation's wars are buried here. Notable among the thousands of headstones and memorials are the graves of President John F. Kennedy, his wife Jackie and their children, as well as boxer Joe Louis. The Tomb of the Unknowns also commemorates all those who died in the nation's wars and there are many memorials dedicated to those who perished in tragic events, such as the Challenger Space Shuttle disaster and those killed in the Lockerbie bombings.
Served by Arlington Cemetary station on the blue line of the Washington Metro Line and open every day with free admission, groups can visit the cemetery whenever they are in Washington, as well as witnessing the changing of the guard ceremonies at the Tomb of the Unknowns, carried out by member of the United States Third Infantry.