La residencia

The House That Screamed, also released as The Finishing School, is a 1969 Spanish gothic slasher film written and directed by Narciso Ibáñez Serrador, and starring Lilli Palmer, Cristina Galbó, John Moulder-Brown, and Mary Maude. It follows Señora Fourneau, the strict headmistress of a nineteenth-century French boarding school for girls where the students begin to disappear under unusual circumstances.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.