Arlington National Cemetery is one of two national cemeteries run by the United States Army. Nearly 400,000 people are buried in its 639 acres (259 ha) in Arlington, Virginia. There are about 30 funerals conducted on weekdays and 7 held on Saturday. The other Army cemetery is in Washington, D.C. and is called the U.S. Soldiers and Airmens Home National Cemetery. All other national cemeteries are run by the National Cemetery System of the Department of Veterans Affairs.

Arlington National Cemetery was established during the U.S. Civil War. Arlington Estate was confiscated by the U.S. because Mrs. Custis had not yet paid her taxes. George Washington Parke Custis built Arlington House to be a memorial to George Washington. He left Arlington to his daughter, Mary Anna Randolph Custis Lee in his will and expected her to give it to her son, Custis Lee. G.W.P. Custis' daughter was a great-granddaughter of Martha Washington (Mrs. George Washington). Mary Anna Custis Lee married then-Lieutenant Robert E. Lee, U.S. Army there. Listed on the National Register of Historic Places in April 2014, the Arlington National Cemetery Historic District includes the Cemetery, Arlington House, Memorial Drive, the Hemicycle, and Arlington Memorial Bridge.

The Tomb of the Unknown Soldier is a historic monument dedicated to deceased U.S. service members whose remains have not been identified. It is located in Arlington National Cemetery in Virginia, United States. The World War I "Unknown" is a recipient of the Medal of Honor, the Victoria Cross, and several other foreign nations' highest service awards. The U.S. Unknowns who were interred are also recipients of the Medal of Honor, presented by U.S. presidents who presided over their funerals. The monument has no officially designated name.