A nuclear bomb-proof bunker that stored coins and currency during the cold war now houses one of the most treasured film archives in the world.

Between 1968 and 1993 the underground bunker held the currency on reserve, the idea being that it would be injected back into the economy to revive it in the case of a nuclear disaster.  That bunker is now the moving image vault at the Library of Congress, and houses 1.4 million film, television, and video elements.

In this video, CBS takes you through the halls of that very archive, and even shows you what is purported to be the oldest roll of celluloid film in the world.