We took this photo last fall in London, and just came across it again. While we're sure some of you have seen something similar before, we don't think we've ever seen this in Chicago... Of course, London's buildings are incredibly old and ridiculously close together, relying on one another for support. So when one comes down, something's got to hold the other two up. And we were utterly fascinated by this sight! Any readers have some technical/industrial insight for us?