On a whim, at 7:00 last night I went to see Shutter Island, the Martin Scorcese movie about two federal marshals (Leonardo DiCaprio and Mark Ruffalo) in the 1950's who investigate a woman's disappearance on a small island on which there is an asylum for the criminally insane. It may be that the asylum is being used for cruel psychiatric experiments, or something of the kind, and the previews hint at questions of whether it will be possible for the marshals to leave once they have arrived.
The movie was creepy and a bit scary, and the ending was less predictable than I had anticipated. I'd say that if the premise or previews for this movie appeal to you, it's well worth seeing.
(Oh, one note. If you try to avoid movies with Holocaust imagery, know that one of the marshals has frequent flashbacks/dreams about liberating Dachau.)