Shoah (all eight hours or whatever)
Gone With The Wind (for its incredible editing and Vivian's acting)
8 1/2 for its visionary images
Persona (I won kudos for my review of this when I was in college)
Casablanca for its depiction of historical existential limbo
Blind Man, an almost unknown movie that makes Tarantino unnecessary
Annie Hall, Interiors, The Butler, and Zelig, Sleeper, among other Woody Allen
Fantasia, despite my mistrust of everything Disney
The Red Desert (Antonioni)
Many others, but this gives the drift.