Honestly there are just too many good ones, I could give a list of at least 50 films I'd recommend without any hesitation at all. But I try to watch as little Hollywood as possible, mostly asian and european cinema.
Right now I'd say Tokyo Story (1953) is the best film I've ever seen.
> Tokyo Story
I watched it because it's on every list of best films, so expectations going in were high. It's not overrated. I don't cry from movies but I did when watching this one. Very subtle and relatable.
Edit: Since we're here, "The Fall" (2006) and "City of God" (2002) are some of my other favorites.