The Science Museum had a lovely selection, from the first journey a year before opening, to early electric trains, to people sheltering in the Second World War. The various construction images are particularly good. The Guardian also created a gallery of photographs covering the network's history, as did the Independent and the Telegraph. History comes back to life in London Reconnections' coverage of the rehearsal for steam's return to the Underground this weekend.
Perhaps the most famous image of the Underground is its map, and the BBC illustrated its development while Google used it as the basis for a celebratory doodle.
Moving slightly away from image-based articles, people rather than pictures were the focus for BBC News, who looked at families whose history is intertwined with the Underground's. Meanwhile, Randomly London listed an epic 150 posts, from assorted media and around the world, about the anniversary.
Finally, I've already shared British Pathe's film archive of the Underground, and a few photographs of my own.