Not being a big fan of modern architecture, I'd say
that London is unfortunately well furnished with all the
modern discomforts. Still, they are a photographic
opportunity of sorts. Much like jackals tearing into a gnu
on the African plain.
Westminster
What sort of a tourist wouldn't?
Cambridge
Ok, so it's technically not in London. I had a
very quick shufti in Cambridge after the airshow at
Duxford; with hindsight, it would have been good to spend
much more than a couple of hours investigating the local
sights. Well, live and learn.