Mysteries of the Abandoned: Hidden America

A monstrous airplane that helped America reach new, historic heights sits decommissioned in Tucson, Ariz.; experts investigate and reveal one of the most important aircraft of the 20th century and its contribution to the Apollo spaceflight program.Further segments of the episode portray the North Wilkesboro Speedway in North Carolina, the Potomac River Defences in Maryland and Virginia, and Fort Hunt in Virginia.