United States v. Lee (1882)
With local cemeteries in Alexandria County and Alexandria filling rapidly with war dead, Quartermaster General of the United States Army Montgomery C. Meigs proposed using of the Arlington estate as a cemetery. The first burial there was made on May 13, 1864. United States Secretary of War Edwin M. Stanton approved the establishment of a military cemetery on June 15, 1864, creating Arlington National Cemetery. By the end of the war in April 1865, more than 16,000 people had been buried at Arlington. In September 1866, a memorial and a burial vault (containing the remains of 2,111 U.S. and Confederate soldiers who died at the First Battle of Bull Run, Second Battle of Bull Run, and along the Rappahannock River) were buried in Lee's former wildflower garden on the mansion's east side beneath the Civil War Unknowns Monument, a memorial to honor unknown soldiers who had died during the American Civil War.
Arlington Memorial Amphitheater
On May 24, 1964, Memorial Amphitheater was the site of a late-afternoon ceremony celebrating the 100th anniversary of the founding of Arlington National Cemetery. During its 50th year anniversary in 1969, the American Legion, along with the American Legion Auxiliary donated an exterior lighting system so that Memorial Amphitheater and the Tomb of the Unknowns could remain lit at night. In the midst of ceremonies also marking the 50th anniversary of the Paris Caucus – President Richard Nixon formally took possession of the lighting system in the nation’s name, flipping the switch that turned the lights on.