LONDON- The Blackfriars Railroad Bridge and its twin the Blackfriars Road Bridge, spanning the River Thames in London, are two of the oldest bridges still in operation. There’s not much mentioned on these two bridges aside from their history, yet there was one aspiring venture that was done on the railroad portion of the bridge which has not only revitalized the structure but has made it a popular attraction. Furthermore, this restoration and modernization of the bridge has set the precedent for finding creative ways to use renewable energy. The bridge is one of three in the world that is now powered by solar energy. In CNN’s Future Cities, the host of the show tells us why.