I really enjoy silent films.
I recently expanded my silent movie collection to include The Toll of the Sea (Hollywood's first full-color film), Shifting Sands (early Gloria Swanson film), Charlie Chaplin's The Circus and City Lights, and a bunch of Douglas Fairbanks' films: The Mark of Zorro, The Three Musketeers, Robin Hood, The Thief of Bagdad, The Black Pirate, and Don Q, Son of Zorro.
So far, I've watched all but the Zorro movies, which I'm holding off until November when I'll watch them to mark the centennial anniversary of the first one.
So far, my favorite silent films are The Sea Hawk, Wings, and, of course, Mel Brooks' Silent Movie.