The Unknowns: The Untold Story of America’s Unknown Soldier and WWI’s Most Decorated Heroes Who Brought Him Home The Tomb of the Unknown Soldier is sacred ground at Arlington National Cemetery. In The Unknowns, celebrated military historian Patrick O’Donnell illuminates the saga behind the creation of the Tomb, the selection of the body to represent the thousands of unidentified American soldiers lost in WWI, and the moving ceremony during which the Tomb was consecrated. A book signing follows the program.