If I remember correctly, something like the last 18 minutes of Alien has no dialogue, just ambiances, sfx and a bit of music. It's just Sigourney Weaver running around the spaceship trying to avoid the alien. The film in general is a fantastic example of how careful sound design can evoke strong emotional feelings (in this case, feelings such as fear and isolation). But the last 18 mins or so particularly relies on the soundtrack to dictate the feelings of the audience.
You may also want to look at animations. Wall-E is one that immediately jumps to mind. Again, no dialogue.
I'm also a huge fan of Aviv Aldema's work on Waltz With Bashir.