The Tomb of the Unknowns at Arlington National Cemetery is also known as the Tomb of the Unknown Soldier. It stands on top of a hill overlooking Washington, D.C.
One of the more popular sites at the Cemetery, the tomb is made from Yule marble quarried in Colorado. It consists of seven pieces, with a total weight of 79 short tons (72 metric tons). The tomb was completed and opened to the public April 9, 1932, at a cost of $48,000.
It was initially named the "Tomb of the Unknown Soldier." Other unknown servicemen were later entombed there, and it became known as the "Tomb of the Unknowns", though it has never been officially named. The soldiers entombed there are:
Unknown Soldier of World War I, interred November 11, 1921. President Warren G. Harding presided.
Unknown Soldier of World War II, interred May 30, 1958. President Dwight D. Eisenhower presided.
Unknown Soldier of the Korean War, also interred May 30, 1958. President Dwight Eisenhower presided again, Vice President Richard Nixon acted as next of kin.
Unknown Soldier of the Vietnam War, interred May 28, 1984. President Ronald Reagan presided. The remains of the Vietnam Unknown were disinterred, under the authority of President Bill Clinton, on May 14, 1998, and were identified as those of Air Force 1st Lt. Michael J. Blassie, whose family had him reinterred near their home in St. Louis, Missouri. It has been determined that the crypt at the Tomb of the Unknowns that contained the remains of the Vietnam Unknown will remain empty.
The Tomb of the Unknowns has been perpetually guarded since July 2, 1937, by the U.S. Army. The 3rd U.S. Infantry Regiment ("The Old Guard") began guarding the Tomb April 6, 1948.
无名士兵墓室被24小时守卫的，而且无名士兵墓每隔半小时有换岗仪式。无名士兵墓前的礼兵在长地毯上要走二十一步，以提示最高礼遇的二十一响礼炮，然后转身面向墓立正二十一秒，接着重复这一过程直到换岗。
石棺里的是一战的无名士兵，地上的三块石板分别是埋葬着的二战，韩战和越战的无名士兵。而入选的越战士兵由于在高科技的帮助下，身份得到确认，1983年按家属的意愿，从这里移灵，所以至今空缺。
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