The U.S. Bullion Depository, better known as Fort Knox, is home of the United States Army and one of the world's most top secret fortresses. Hidden deep inside the vault is an estimated $73 billion dollars in gold. Almost all information about it is classified. Through interviews with eyewitnesses, rare photos and rarely seen films, we will construct a picture of what the building might look like. Hear testimony of those journalists and congressmen who were among the select few invited inside in 1974. Discover the history and secrets behind the Army's tank warfare and the classified military technologies it will use to fight the wars of the future.