CULPEPER, April 14 -- Once upon a time in the golden days of Hollywood, the movies were bigger, the stars brighter and the celluloid they were filmed on was, well, explosive.

Which is why the US Library of Congress maintains a special, fireproof vault in Virginia, near Washington, DC.

There, the highly combustible nitrate film used from the dawn of cinema in the 1890s until the early 1950s has a permanent home, rarely accessed by the public but toured by AFP.

Lost movies on the volatile but durable medium are still being discovered and preserved in the facility. And thanks to digitization, the lost treasures can also be safely viewed for the first time in decades.

Some 145,000 film reels are stored in strictly fireproof conditions in ...