Only once have I watched an American History Channel “documentary” (and I use that word very loosely) – on Vikings, and I spent half the time correcting their blatant misinformation. BBC documentaries, on the other hand, are frequently watched in our household; they are well-researched, well-presented, and entertainingly educational.
One such documentary is “The Face of Britain” in which they trace the history of Britain through the genetic studies of Oxford University, led by cancer and population geneticist Professor Sir Walter Bodmer. If you’re interested in British history, genetics, or science, I would highly recommend this DVD, as well as the website link above (where there are additional interesting articles on the topic). Genetics tell us where we come from; but they also map where regional similarities come from; what makes Irish generally red-haired and Scandinavians blonde? Not only complexion and hair or eye colour, but even bone structure: Regional differences in what make a person look like they come from “X” and not “Y”.
There was also a study of facial averages, where thousands of portraits were combined into one image to give a common face for various regions around the world. I have friends from many regions of the world, and I can confirm that these average faces are fairly accurate (I can recognize friends and/or their facial features in the images).
Both topics are well worth looking into!