The document provides a history of horror films from the 1920s to the 1970s. It describes how German Expressionist films of the 1920s-1930s influenced the horror genre with their anti-realist styles. In the following decades, horror films featured monsters like Dracula, Frankenstein, and the Wolf Man. The 1950s saw an increase in sci-fi horror films influenced by fears around space travel and nuclear weapons. Companies like Hammer Productions adapted classic horror stories in color films during the late 1950s. Horror films of the 1960s-1970s reflected the grim outlook of the time and often revolved around children and themes of possession and exorcism.