Well, the London one might be doable, in terms of road widths.
There are plenty of tube stations about too, but closing those roads, which are some of the busiest in London would be impossible to orchestrate. You'd pass a number of well-known areas though. The pits are on Park Lane, on a british monopoly board this is the most expensive square
, its where there are lots of very posh hotels and car showrooms (Aston, McLaren, Porsche).
The final corner is Marble Arch, as the name suggests a large marble arch.
The track also passes by the Royal Albert Hall, and through Hyde Park, so its quite a scenic location