Recently I watched this documentary series about World War II in (HD) color on Netflix and really liked it. In 14 episodes you get to see a well documented overview of WW2, starting with the events leading up to WW2 in both Europe and Sout-East Asia, the beginning stages with the fast advances both Germany and Italy made in Europe, and Japan in Asia, the mistakes made by the aggressors, the fighting back by the allied forces on different theatres, and ultimately the victories over Germany , Italy and Japan.
The interesting part about this series is that the original black & white footage has been coloured by advanced colouring techniques. While you can occasionally spot the clearly artificial colouring, most of the times it is unobtrusive and hardly noticeable. Watching these scenes in colour definitely add an aspect of realism to them, compared to the same scenes in black & white.
There are many documentaries about World War II, and this documentary deserves a good place between them.