Boards
Street art (Waterloo stationcentric)
This morning on one of my many circuitous routes to work I wandered into what I thought was a normal subway near Waterloo station and found the remnants of this in what turned out to be a disused taxi tunnel:
http://www.pbase.com/alexis/banksy
It's worth a quick look if you happen to be passing by Waterloo. It's quite well hidden, I'm not sure I could find it again.