View Underground London in a larger map
The map above is a creation from the team over at the Londonist. Basically it shows many of the secret and hidden things you can find right below London's streets. This includes not only abandoned underground stations, but also burred rivers like the Fleet, deep level World War 2 shelters, and even the Camden catacombs.
Enjoy your Friday afternoon by having a look around and seeing what you can find.