Hark! A Vagrant is a website of comics written and drawn by Kate Beaton. They are irreverent, charming, and often hilarious.
Beaton has a degree in history, and her comics reflect that. They all have something to do with moments in history, or famous people (from Beethoven to to an imagined exchange between Jules Verne and Edgar Allan Poe). I liked this one of the Brontë sisters:
And this one, of Canadian Prime Ministers:
Funny stuff.