The Tomb of the Unknown Soldier at Arlington National Cemetery in Arlington County, Virginia, United States is the burial site of a World War I soldier whose remains were unidentifiable. After a design competition was held in 1928, the winning project was completed in 1932. The site now also includes the gravesites of two other unknowns, one from World War II and one from the Korean War, who were buried under two slabs between it and the Memorial Amphitheater behind it.