Arlington National Cemetery

View of a soldier from the "Old Guard" of the third US infantry protecting the Tomb of the Unknowns; Arlington National Cemetery, in Arlington, Virginia, is an American military cemetery established during the American Civil War on the grounds of Arlington House, formerly the estate of the family of Robert E. Lee's wife Mary Anna Custis Lee, a descendant of Martha Washington. The cemetery is situated directly across the Potomac River from Washington, D.C. More than 300,000 persons are buried here on 624 acres (2.53 sq km). Veterans from every one of the nation's wars are interred in the cemetery, from the American Revolution through the military actions in Afghanistan and Iraq. Pre-Civil War dead were reinterred after 1900. The Tomb of the Unknowns is also known as the Tomb of the Unknown Soldier. It stands on top of a hill overlooking Washington, D.C. and is is part of the Arlington Memorial Amphitheater, completed 1921. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 12/9/2007