London genius Ian Visits has (once again!) got his hands on a cache of TfL documents to make a thrill run up the leg of any tube geek.
It's no fewer than 120 three-dimensional diagrams of every sub-surface Underground station. And they're just sort of lovely. Above, for example, is Piccadilly Circus. Here's the labyrinthine reality of Bank:
And here's a visual guide to London's favourite tube station, Westminster:
The copyright of the images remains with TfL, but we dare say they'd make a pleasantly technical alternative to all that tube map merch. Just think of the nerdy wallpaper they could flog.