One of the most unique American films to come out of the 'black and white' era is Seconds (1966) . I can't imagine how it got greenlit, except for the fact that John Frankenheimer and Rock Hudson somehow got involved. It plays out like an atmospheric, Kafka-esque nightmare. Kind of gets to a stall somewhere in the middle and never really picks up again, but it's an amazing piece of cinema nontheless. Highly recommended.
Not sure if this have been mentioned and/or what you are looking for genre wise but... Strangers on a train "https://www.youtube.com/watch?v=0QCGYZDIN-k&list=PLB76F1A8DA76BFE87" /a>
Playlist Here (some parts may have been deleted because of copyright)
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Film Noir
Screwball Comedies
Maybe Old Scary Films
Thanks