What old movies hold up because of a lack of special effects or because clever use of effects?

https://sh.itjust.works/post/49579543

What old movies hold up because of a lack of special effects or because clever use of effects? - sh.itjust.works

What older movies made a good use of either side stepping special effects or have effects that somehow still hold up today? Why are they good movies?

Definitely Forbidden Planet. Killer electronic music soundtrack as well.
The 50’s version?
I think there is only the 1956 version. Maybe you’re thinking of Day The Earth Stood Still?