Snapped this as I was walking past on Thursday, it's the Millennium bridge that spans the Thames between the Tate Modern (in picture, the old Bankside power station) and St. Pauls. It's famous because it used to "wobble" and is known affectionately by Londoners as "the wobbly bridge". The regular plodding of feet crossing the bridge caused a natural resonance to occur and it swayed quite disturbingly. This phenomena is why soldiers always break step when crossing bridges like this. Engineers fixed the problem in 2002 by bracing the structure using the cables you can see protruding from the sides of the walkway.
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