At the start of the 1960's cinema continued to deliver the same B-movie monsters and saucers of the 1950's. But as the 1960's started to swing anxiety about social change and nuclear war started to manifest itself in more mindbending and surreal fare.
I've tried to keep this list weird; i.e. films that have either strong Sci-Fi themes or interesting aesthetics. As such I have tried to avoid franchises such as James Bond or Godzilla, B-movies, horror or more mainstream films like Marooned.
Nothing wrong with those films I just didn't think they fitted in this list.