Die Augen der Mumie Ma

Director: Ernst Lubitsch
Year: 1918
Country: Germany
Runtime: 63 minutes

Also known as Eyes of the Mummy Ma. Often classified as a horror film but actually a melodramatic tragedy - and a pretty hammy one at that.

Full film on YouTube.

Der Golem

Director: Paul Wegener / Henrik Galeen
Year: 1915
Country: Germany
Runtime: 60 minutes (4 minutes)

Also known as The Golem. The original runtime was 60 minutes, but the film is lost. The extant fragments, shown in the video above, total just under 4 minutes.

Dr. Jekyll and Mr. Hyde

Director: Herbert Brenon
Year: 1913
Country: USA
Runtime: 27 minutes

Another version of Robert Louis Stevenson's novel, starring the improbably named King Baggot in both roles.

Der Student von Prag

Director: Paul Wegener / Stellan Rye
Year: 1913
Country: Germany
Runtime: 41 minutes

Also known as The Student of Prague. Often considered to be the first ever feature-length horror film and a forerunner of German Expressionist cinema.

Fan-made trailer by DutchWestIndianCo. The full movie is available on YouTube here.