All Quiet on the Western Front
This classic anti-war film tells the story of German Army recruits in the heat of WWI. It's often regarded as the best anti-war film in history. However, Germany stopped showing the film due to its propaganda and actually let mice into movie theaters to discourage people from watching.
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Nearly every film rating site describes this film as "one of a kind." It is the most expensive film ever made in French history, and, though it wasn't necessarily loved by audiences, it did win a lot of art awards. It made the British Film Institute's "50 Greatest Films of All Time" list.