A challenging film, but one that is really worth your time if you are a cinema lover. Trying to sum up this film would be quite a difficult task. You could call it a political, pop-art, existential exploration of history and art, human consciousness, and reality. The narrator's voice is really haunting, probably the best narration in a film I have ever seen.

It's mainly an exploration of memory, how humans remember, and how we rewrite memory much like history rewrites itself. The way I see it, it mixes fiction with documentary, and is more concerned with a sort of subjective reality Chris Marker has built around the events we are shown. I think the "main plot" is quite clear though, but of course there are tons of digressions and small observations which can make it a bit hard to follow at firs, I guess. I recommend you rewatch it! Gets better each time.

Best film of all time, by the way.

Difficult movie... Both boring and interesting: I found some commentaries very intelligent, others both snobish and empty (pretentious).
The narration in French is poorly audible, unfortunately, and too fast. This spoils the good moments, the profound ones, which would deserve clear narration and a slower rythm, to allow correct assimilation.