The Adventures of Prince Achmed is a 1926 animated feature film by Lotte Reiniger. It features silhouette animation. Wikipedia says it's "the oldest surviving animated feature film". I think it's a joy to watch. I like her other work, also.
Watch it online at youtube without English subtitles, but it's an easy story to understand:
The Dancing Image has an article. Weird Wild Realm calls it "Truly a superb piece of animation".