1864    Arlington National Cemetery is established when {{convert|200|acre|km²}} around Arlington Mansion (formerly owned by Confederate General Robert E. Lee) are officially set aside as a military cemetery by U.S. Secretary of War Edwin M. Stanton.

1921    The Tomb of the Unknowns is dedicated by US President Warren G. Harding at Arlington National Cemetery.

1954    U.S. President Dwight D. Eisenhower dedicates the USMC War Memorial (Iwo Jima memorial) in Arlington National Cemetery.

1958    Memorial Day: the remains of two unidentified American servicemen, killed in action during World War II and the Korean War respectively, are buried at the Tomb of the Unknown Soldier in Arlington National Cemetery.

1963    President John F. Kennedy is buried at Arlington National Cemetery.

1967    The body of President John F. Kennedy is moved to a permanent burial place at Arlington National Cemetery.