This might be a bit nerdy, even for me, but I happened upon this website today while doing my work. (I have been lucky enough to cross paths with the website’s coauthor several times — he also graduated from Cal.) Anyways, this website shows the distribution of common genetic variation in the world. Each pie chart represents a population that has been assayed (or, genotyped) at positions in the genome that we know are variable. The pie charts reflect how that variation is distributed.
I was surprised to see how clear it is that Africa harbors most of our variants.
Be sure to click the ‘random’ button to generate a few maps.