THE MONSTER OF VENICE 1965 - Definitely hits the slasher vibe with a masked killer. Some creepy moments especially when the killer among some skeletons.
"Learn from me, if not by my precepts, at least by my example, how dangerous is the acquirement of knowledge and how much happier that man is who believes his native town to be the world, than he who aspires to become greater than his nature will allow." Frankenstein