Man with a Movie Camera presents everyday Soviet life during one day, from dusk to dawn, in four different cities. Vertov said that it was without story, without theatre. There are no actors, and no plot, just truly inventive filming of ordinary people going about their lives.
It evokes the experimental modernist photography of the time, and I think that as well as being important for movie history, it is a great work of art.
The film is silent, so it doesn't matter what language you speak! Although, different soundtracks have been composed for it.
I have taken the stills from wikipedia, where you can watch the whole thing!
If you like this, you might also enjoy a similar film by Walter Ruttmann, Berlin: Symphony of a Great City, from 1927.