"There are certainly many classics that nearly every serious film fan has seen; films like Citizen Kane, Casablanca, The Godfather, 2001: A Space Odyssey, or Rear Window have attained a status that makes them required viewing for anyone interested in film history. Not only are these masterpieces that have stood the test of time, but they are responsible for setting trends that would spawn countless imitators.
However, there are some films considered classics that have been lost to time. Some were considered noteworthy at the time, but have lost the favor of renowned critics or slipped into obscurity. These films are deserving of immense praise, as they introduced new cinematic voices and told breakthrough stories."