If you want to watch a film about a living force of nature, Zorba the Greek must be up there. Directed by Mihalis (Michael) Cacoyannis, and wonderfully filmed and acted on location in Crete, all the characters are very authentic.
I think this must have been Anthony Quinn's most outstanding work. He was also in Lion of the Desert, which I really liked and have seen several times since 1981 when it first came out. Lust for Life is another film he was in that I must get out on DVD. I think he was one of those great actors that improved with age.