Dark City (1998)

Links: TVTropes, Wikipedia, IMDB (7.8).

Dark City was the first in the series of "reality is a lie" mindscrew movies that all came out around the same time in the late '90s.  The premise is a bit silly (in a comic book-ish sort of way), but the visuals are very powerful, and that helps to suspend disbelief and bring the fictional world to life.  I have a hard time pinning down exactly why I like this movie as much as I do, especially since it clearly worships the Film Noir I dislike so much, but it's just a well-told, well-directed story.  The director's cut (2008) improves the film even more, and if you've seen the original but not the director's cut I recommend you check it out.  Score: 4 stars out of 4.