If you didn't watch the Murnau masterpiece Nosferatu, eine Symphonie des Grauens you can download on Internet Archive and watch it. There is also the Night of the Living Dead and lots of others films, commercials, trailers and audiovisual material. The site is fabulous; you have to see it.

More about Murnau and his films here and about movies on Internet Archive here.

Update: Watch Nosferatu at Videos with Bibi