Ghost Stations of the London Underground

PinchDuck writes "Check out this site to get a tour of London Underground stations that have been abandoned during the century+ history of the commuter system. You can apparently still get to some of them! (though not by taking the Tube, obviously). I wish I had found this site 2 weeks ago, when I went to London, but now my geeky explorations must wait until my next visit (having just flown back in to Detroit today)."