A list of films, science-fiction, horror, fantasy, a list of 13. I would challenge anyone to come up with a list of another 13 of equal value.
Most of these exceed 'genre', some far so.
2001: A Space Odyssey
Shadow of the Vampire
Bram Stoker's Dracula
. (See addendum later, on August 23, 2010 -- a 14th film: Don't Look Now)