Nosferatu, eine Symphonie des Grauens is one of my favorite films ever. The idea was stolen straight out of Bam Stoker's Dracula to the extent that the company went bankrupt when Florence Stoker sued and won. However, this doesn't change the fact that this film is a masterpiece. The soundtrack is pristine - you've heard it, you probably just don't know you have yet. The film makers used the advantages of the silent film format rather than letting it's lacks hinder the movie. They used subtle tricks like fast-forwarding and variable pacing flawlessly. The sets, costumes, and camera angles are pure perfection: the repetition of shapes, the symbol of the arched door echoing the symbol of the coffin, shooting shadows instead of the actors, the contrast of beauty and evil - the film is spot on.
The original title means Nosferatu, a Symphony of Horror, and the movie still scares me. Luckily the copyright is up on it so you can download it freely and legally from the Internet Archive here.