I'll get the ball rolling with 3 suggestions - more contributions here!

Firstly there's Putney Bridge in West London. Cross from Putney to Fulham over the Thames and look to the left. The tall old trees of Bishop's Park ( formerly the residence of the Bishops of London ) and then just peeking over them the floodlights of Craven Cottage - home of Fulham FC.
On an evening of a game the sight of any glowing floodlights are enough to stir a football supporter whichever ground.
Its a pretty bridge too, with fine Victorian lamps.

In the opposite direction there's the grand looking buildings of Putney and rowing clubs.

The first Putney Bridge was built by a local master carpenter, Thomas Phillips, between 1727-9. It had been designed by the architect Sit Jacob Ackworth, but the whole bridge was removed and replaced between 1882-6, with a new bridge designed by Sir Joseph Bazalgette.

Putney Bridge has been the starting point for the University Boat Race since 1845.

Still in London, let me take you further east to the centre and Westminster bridge.
Cross this towards The Houses of Parliament in the rain at midnight as Big Ben is chimming. Utterly London. Westminster looks splendid at night, lit and palatial with its towers and almost golden hue. Its a great building with 9 miles of corridors within giving it that extra air of dark old passagesways where deals are done. And things have happened there, I mean loads of things, about as much history as is worth having really. Charls I was tried in the great hall and later Cromwell head was stuck on a pole outside just next to where now is his statue. Gladstone and Disraeli would have tussled across the dispatch box no doubt equally emboldened by the bracing rain and the statue of Boudicca on their way across the river.

Leaving London let me take you across the Kennedybrucke in Hamburg. It links the two lakes of Hamburg the inner and outer Alster. Its a wet city and has its fair share of bridges many prettier and more strollable, but this one has to take the prize for its location although with the traffic and railway its two sides are almost inpenetrable.
The side of the inner Alster gives you the view of the green copper tipped tall buildings of the town centre, the town hall and churches including Michael the baroque symbol of the city on the right. The copper roofs and amount of water make Hamburg particularly sparkly in the sunshine but also particularly drab in the rain.

the inner alster, from the side of the bridge

The fountain spurts out of the lake and Hamburgers can be proud as the view invariably gets an "oooh" from first time visitors. Its pretty and grand and is saying "I am a proper city".
The outer alster on the other side is enormous and scattered with the little sails of Hamburgers who feel a need to claim seamanship as in their blood seeing as they come from the salty bit of Germany. A lake within a city is a fine idea.