I've been talking with this cool old Russian I work with about Soviet film, and he told me about this wild thing I'd never heard of. He said when he saw it in the theatre in Moscow everybody got out of their seat and applauded when it finished.

From Wikipedia: Tale of Tales, like Andrei Tarkovsky's Mirror, attempts to structure itself like a human memory....and has received the title of greatest animated film of all time in various polls.

It has a heartbreaking sequence about dudes disappearing from society when the Nazis invaded, but mostly it is tough to fully resolve. Just on a sheer craft level though I've never seen anything really like it, I still can't figure out how they did like, a bunch of stuff. So wild.