That scene, with the windmill blades in the moonlight, is absolutely iconic! I remember seeing it as a kid on afternoon TV, and was just entranced by the whole sequence. This film was, and remains, one of my all time favorite Hammers.

"[The audiance] will populate the darkness with more horrors than all the horror writers in Hollywood could think of. If you make the screen dark enough, the mind's eye will read anything into it you want! We're great ones for the dark patches." -VAL LEWTON