1. The White Sun of the Desert (1970) imdb rating 8,0.
Moserfilm, the legendary Russian film studio has released a number of subtitled films on their youtube channel.
The video above is the trailer, watch the full movie for free on youtube
2. Prince Yeonsan (1961) imdb rating of 7,5.
The South Korean Film Archive has released a number of restored classics on their youtube channel, including this historical drama.
3. Tokyo Story (1953) imdb rating 8,3.
A Japanese court has ruled that most Japanese films made before 1953 are public domain. This one is listed by archive.org as public domain
4. D.O.A (1950) imdb rating 7,4
The classic noir about uranium poisoning has been in the public domain for a number of years.
5. Nothing Sacred (1937) imdb rating 7,4
A very funny color comedy about uranium poisoning from 1937.