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.
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.
Right now I'd say Tokyo Story (1953) is the best film I've ever seen.