Filmed on the Ellis Estate in Scituate, MA where another Italian horror film, Ghost House: A Casa do Horror (1988), was filmed.
One of the early VHS issues of this film in America had several of the film's reels out of order, further confusing the already erratic story.
Third part of Lucio Fulci's "Gates of Hell" Trilogy. The other two films include: Pavor na Cidade dos Zumbis (1980) and Terror nas Trevas (1981).
The film's original shooting title was "Freudstein."