Map of Roman Air Bases in 2nd Century AD
LOL! I love maps of stuff that doesn't exist... They correspond so well with the rest of life.
Speaking of hilarious images, here's one of my originals that I posted in Great Finds a while back, which I realized not everyone would've seen, which'd be a shame since it's, like, so knee-slappingly clever and keeb-related. It's a flowchart of my personal keyboard-buying decision process.