Shutter Island
I watched Shutter Island 3 times and it got better every time. DiCaprio and Mark Ruffalo work really great together but the whole cast is chef's kiss. Obviously the plot twist is the best thing about the movie but 2 things I would like to highlight. dicaprio's performance and the 'open' ending are just great.
And I liked the Ww2 stuff especially when DiCaprio spoke German