In 2006 NASA had to get hold of and restore, copies of the original moon landing from CBS and the Johnson Space Centre after admitting to accidentally recording over their own tape recordings.

3.4 million copies of the animated Disney movie, The Rescuers, was recalled in 1999 because it contained two frames where there was a naked woman in the background.

Since 1875, the exact weight of a kilogram has been defined by the International Prototype of the Kilogram, a cylinder that sits locked in an environmentally regulated vault outside Paris. Every 40 years, it’s removed and compared to a half-dozen copies around the world.

While World War II was being fought, the original copies of the U.S. Constitution and the Declaration of Independence were taken from the Library of Congress and kept at Fort Knox, Kentucky.