The first feature-length films to include what are regarded as monsters were often classed as horror or science fiction films. The 1915 German silent film "The Golem", directed by Paul Wegener, is one of the earliest examples of film to include a creature. The German Expressionist "Nosferatu" in 1922, and the depiction of a dragon in Fritz Lang's Die Nibelungen in 1924, followed tradition. In the 1930s, American film studios began to produce more successful films of this type, usually based on gothic tales such as "Dracula" and "Frankenstein" in 1931, both heavily influenced by German Expressionism, followed by "The Mummy" (1932) and "The Invisible Man" (1933). Classified as Horror films, they included iconic monsters.