I can suggest movies made before most in this thread were born I think? I only suggest movies I have watched. Here are a few......
The Treasure of the Sierra Madre (b&w) a classic western.
Arsenic and Old Lace (b&w) A great comedy.
The African Queen- A great adventure for which Bogart won Best Actor.
Harvey (b&w) Another funny one starring Jimmy Stewart.
Sargeant York (b&w) WWI True Story.
The Wild Bunch- A great western with a great cast.
Hobson's Choice (b&w) A good Bristish comedy starring John mills and Charles Laughton.
Ben Hur- A classic which in 1960 won the academy awards for: Best Actor in a Leading Role; Best Actor in a Supporting Role; Best Art Direction-Set Decoration; Color; Best Cinematography, Color; Best Costume Design, Color; Best Director;, Best Effects, Special Effects; Best Film Editing; Best Music; Scoring of a Dramatic or Comedy Picture; Best Picture; Best Sound
I am also a fan of silent movies, so if folks are interested I can suggest some of these too.