jstott.me.uk:

London Underground Map

Someone thought it would be a good idea to see what the London Underground map would look like if it was superimposed on a Google map. Seeing as I already had a list of latitudes and longitudes for all of the stations on the Tube, I was able to fairly quickly put together this map. It's not perfect - where more than one line runs parallel with each other the lines are drawn on top of each other, and track between stations is only shown as a straight line between the two stations.

Also check out the Madrid Metro Map!