Don't Look Now (1973)
This is a great movie, one that definitely does a great job at creating atmosphere and having it crawl under your skin. There is a haunting subtlety that works well within the disturbing character driven plot. Yes, the pacing seems a bit slow and it does not answer all of the questions that pop into your mind, but it all comes together with the Venetian backdrop. Being from the 1970s, the film also contains one of the original (and in many ways beautiful) love scenes ever filmed in a horror / thriller. Movies like this are few and far between (especially today), check it out if you have not seen it, you will not be disappointed.