The Cabinet of Dr. Caligari

At a mountain fair, the sinister Dr. Caligari exhibits a sleepwalker who can foretell death, and a string of murders begins. With its painted shadows and leaning, impossible walls, Wiene's film is the cornerstone of German Expressionist cinema.

CineVault catalogues this film and links to its preservation copy at the Internet Archive. The Cabinet of Dr. Caligari is in the public domain.