Who knew such a landmark could also be such an "out of the way" place?
This is a show card from the 1920s on display in one of the catwalks between the towers of Tower Bridge. Amazon sells prints of this for £6.49 (about $10 USD), but I got mine for free by taking the Tower Bridge tour with my camera. After an initial presentation about the history and construction of the bridge, you are able to explore the elevated walkways between the towers from which you get an interesting view of London. It's not not quite equal to the London Eye, The Shard or the top of St. Paul's dome- but still an interesting view. (It's worth it to do at least once, and because I've been to London with three different people on their first trip, I've done it three times!)