Arlington National Cemetery was created in 1864 on the grounds of Arlington House, owned by Robert E. Lee’s wife when the Civil War began. It is the most revered national cemetery in the United States. Besides the Tomb of the Unknown Soldier, Arlington National Cemetery contains more than 250,000 military grave sites as well as the graves of many nationally important men and women. The Kennedy brothers, World War II hero Audie Murphy, astronauts, explorers, U.S. Supreme Court justices, and many other notables are buried there. Bus tours are available, and the information center includes a grave location system.