Topkapi is a 1964 heist film directed by Jules Dassin and starring Melina Mercouri, Peter Ustinov, Maximilian Schell and Robert Morley. Akim Tamiroff is also in this. This movie is great fun. Definitely re-watchable. It's enjoyable on many levels and the acting is wonderful, but that should be no surprise considering the talent involved.
DVD Talk says, "It's one of the classics of the genre". TCM has an overview. Rotten Tomatoes has a critics score of 89%.