Finished Season 3 of Vikings and the World at War (got it on Blu-Ray, WW2 docco from the 1970s) and thought both were excellent (had seen World at War before, but so many years ago could have been rose-coloured glasses, was glad to find it wasn't. Recommnend both, and the second to pretty much anyone with an interest in history. First isn't bad for an interest in history as well. While most footage in it is B&W (and low res), World at War actually has the more disturbing scenes, so don't recommend either for children!