Originally Posted by Arhu 
12 Angry Men
Great film, with a minimal set but ever so interesting dialog. I need to watch more of the classics …
Yes, all time classic. The remake from the 90s is also pretty good.
Quite surprisingly movies haven't become better in the last decades. Technology advances, more is possible now, but movies as a whole are different - but not better.
Continue with
Judgement at Nuremberg or
Witness for the Prosecution (Billy Wilder's version; the remake with Diana Rigg is also very good) if you haven't seen them yet.