The Tomb of the Unknown Soldier is located at Arlington National Cemetery in Arlington, Virginia, United States. It is the white marble sarcophagus and surrounding tomb that honors unidentified American service members from World War I, World War II, and the Korean War. The site is guarded 24/7 by soldiers from the 3rd U.S. Infantry Regiment (The Old Guard), with Changing of the Guard ceremonies held regularly throughout the year. If you’re planning a visit, you can expect the solemn, highly choreographed rituals and an opportunity to pay respects on the cemetery grounds.