Nice map that overlays the United States on Europe to help get a sense of scale. It’s a pretty amazing thing to see. From the looks of it, the Mediterranean is about half the size of the US.
The site, radicalcartography is actually full of totally awesome maps: Manhattan building maps, currency pegs, time zones (an animation that cycles through all of them), errant Manhattan (size comparisons of Manhattan to other cities) and North American subways. Seriously, I could have listed just about every project on the site, just go click around, it’s amazing.
As an aside, I’ve also cataloged it at a tumblr I may or may not keep up with called, appropriately, nice chart.