These maps of the London Underground give a sense of how much transit maps tend to distort distance for the sake of clarity. At top is an official map of the system; at bottom is a spatially accurate map of the system.
I'm a 23 year old grad student at Caltech in Pasadena, CA, and a big fan of maps. This is where I'll be posting some of my favorites as I find them, as well as some maps I've drawn myself (look for the tag #original or add /tagged/original to the url). Happy browsing!