King's Cross St.Pancras
A model showing the underground tunnels under King's Cross and St.Pancras. Circle / District Line (Yellow), Thameslink Line (Green), Northern Line (Black), Piccadilly Line (Dark Blue) and Victoria Line (Light Blue) are all shown, as are other tunnels (Grey), presumably for James Bond baddies to get around London.
Note how the Victoria Line snakes off to the North. This is so it can go through Euston at the right angle to then head towards Warren Street.