Megastructures
Hoover Dam
TV-PG
S3 • E5 May 16, 2006 60mExplore the US Treasury's impenetrable subterranean vaults housing monster money-making machines that churn out billions of dollars. See the army of protectors that ensure the world's most powerful economy with the mantra: "In God We Trust". Discover the elaborate systems of design and protection at the US Treasury premier currency manufacturer and her sister operation, the Bureau of Engraving and Printing.