I've been reading a neat little webcomic for a while now, called Teaching Baby Paranoia, that mixes clean illustration style with an obscure* historical fact every week.
The picture above is from this week's comic, featuring gambling, bank robbers, archaeology, blimps and a dose of irony (click the image to view the comic).
* It turns out the facts are a bit more "obscure" than I initial thought. The latest strip, which is an obvious political commentary, triggered a warning bell. A little googling supported this premonition. So the sentence may read more accuratly as a made up historical fact than an obscure one.