Oh, Em, Effing, Gee!
They found a full version of Fritz Lang's "Metropolis" in Buenos Aires.
The original version was screened in Berlin in 1927 and then edited down to the shorter versions we know today.
In 1928 someone in Argentina arranged for the long version to be sent and after a few screenings it was acquired by a film collector and later given to a film museum where it's remained ever since until a new curator found it!
Apparently it's due to be restored and released on DVD next year.
Some links:
http://www.aintitcool.com/node/37324
http://www.aintitcool.com/node/37332
http://www.zeit.de/online/2008/27/metropolis-vorab-englisch
http://www.youtube.com/watch?v=vq2Uc61YRMY
The original version was screened in Berlin in 1927 and then edited down to the shorter versions we know today.
In 1928 someone in Argentina arranged for the long version to be sent and after a few screenings it was acquired by a film collector and later given to a film museum where it's remained ever since until a new curator found it!
Apparently it's due to be restored and released on DVD next year.
Some links:
http://www.aintitcool.com/node/37324
http://www.aintitcool.com/node/37332
http://www.zeit.de/online/2008/27/metropolis-vorab-englisch
http://www.youtube.com/watch?v=vq2Uc61YRMY