The London Underground (no people)

Brief

Enter your best photos of the London Underground. Some of us use or have been on the London Underground transport system and experienced the stress, confusion and lack of space, but this contest is to show your experience of the architecture, symmetry and geometry within the designs of the tunnels and stations. No people to be included in the images, and all photos must be from the London Underground only. Entries can be in colour or black and white.