I had an awesome teacher for my art history minor in college that was really, really into the occult. She had a collection of fine art which included all sorts of creepy things like original Goya prints. And she brought them into class for us to look at close up. Best time of my life, taking all those art history courses with her.
Anyhow, Goya. Poor, mad bugger. He has plenty of saner work with portraits and whatnot but what really interests me is his dark art work.