Well, in many collections of horror stories, 'The Monkey's Paw' is often included. It's a story about a cursed paw that grants wishes in the most dreadful ways. 'The Cask of Amontillado' is also a great one, with a man seeking revenge by walling up his enemy alive in a catacomb. And there's 'The Strange Case of Dr. Jekyll and Mr. Hyde' which shows the duality of human nature in a very spooky way.