Waterloo Bridge
I am most familiar with Waterloo Bridge, pictured, as I frequently walk across the Charing Cross pedestrian bridgeway from Waterloo Station to go to "town" (or "central", as the kids now say). Evenings are best as there is a single strip of lights that traverse the bridge adding colour and connecting North and South London.
Man, how the skyline has changed since 1997 and it continues to do so: at night, red warning lights dot the cityscape as new buildings go up and up, the St Paul's rule be damned (until maybe 2008 no building in central London could obstruct the view, or be taller than, St Paul's dome).