Maps/charts. Two interesting discoveries the internet gave to me.

This may just be the most interesting map search I've ever seen. It nearly shows the history of a place by its maps... Thanks so much to the David Rumsey Map Collection for its sublime interesting-ness.

http://rumsey.mapranksearch.com/

Oh, and heres a chart history of the world, divined from the same site. How interesting. I want one for my wall.

(I also found it on Slate... which is sortof cheating.)

See it BIGGER