The Tomb of the Unknown Soldier is a tomb located in Arlington National Cemetery. Also called Tomb of the Unknowns, the tombs house the remains of an unidentified World War 1 soldier, the remains of an unidentified World War 2 soldier and the remains of an unidentified Korean War soldier. The Tomb of the Unknowns, which has been guarded continually since July 2, 1937 and is guarded day and night, 365 days per year.