I thought it was Nosferatu (1922, Germany) but the earliest known horror film was a French one, The House of the Devil, 1896, which is pretty close to the start of motion pictures. That's according...
The first horror film to be shot in two strip Technicolor was 'Doctor X' from 1932.
NO because that is stupid
Room 13 Part 2 comes out January 13th.
From the imaginations of creative individuals.