I'm watching Third Reich on the History channel. I came in at what I think was the midway point of the first episode ("The Rise;" this one is called "The Fall.") The visuals were primarily filmed by amateurs with their personal film equipment. I find that aspect the most interesting, that and how much of the film was shot in color. Although I do wonder if some of what I'm seeing was colorized.
The propaganda films are stunning. I can tell they were filmed by professionals well versed in choreography and scripting.