There's a film that was just recently made of original German propaganda of the Warsaw ghetto during World War II.
The footage belongs to an unfinished propaganda film and say in a vault for almost ten years before it was discovered. Though, I guess it took another fifty to put it to any use.
I'd like to see this movie. So far it looks like an intriguing glimpse into the political mind of the Third Reich, but also how occupied Poland looked, if through the lens of a Nazi propagandist. I'll be using this for reference in the future, most definitely.