Another one for the glory list
One other example (this time in brick and stone) is the Ouse Valley Viaduct (aka the Balcombe Viaduct) in Sussex, between Balcombe and Haywards Heath.
It's another stunner of a hidden gem. In terms of magnificent architecture it's great, at least now they've fixed it up after a sad number of decades of neglect (which was kinda worrying given it carries the main line between London and Brighton).
But if you're driving down towards HH from the East Grinstead/Crawley/Gatwick area via the backroads (rather than the M23) it's a wonderful surprise to go round a bend or two in the tree-lined road and then suddenly this beauty appears in front of you (and indeed over you, as the road goes through one of its arches).