The jigsaw puzzle to end all jigsaw puzzles. Not only is the map of the London Underground a great idea for a jigsaw puzzle (get them at Stanfords), but this guy has taken it one step further and custom-made a jigsaw puzzle of Simon Patterson's "spoof"/ "arty" map of the London Underground - The Great Bear - where he replaces station names with the names of comedians, philosophers, sports people etc etc to draw a connection between them and the lines they are on. The Great Bear was shortlisted for the Turner Prize in 1997 and made over ten thousand pounds for Patterson when it was auctioned.
In the jigsaw puzzle above many of the shapes are also represent things found in London and there are travel references like commuters, a bowler hat(!) and the British Rail logo too!