From a comment exchange with alwayswondered, an impulsive resolution was born to visit all of the Magnificent Seven cemeteries in London. I've been to three of them previously (Highgate, Brompton and Kensal Green), but I never pass up an excuse to visit a cemetery.
Since I work quite close to it, it was no trouble to dash quickly down to Brompton Cemetery on my lunch hour. (I would have liked to stick to public-transport-or-walking rule when it comes to these projects, but to keep the venture within my time limits, I had to cab it from Imperial.) My favourite grave markers are humanoid statues and Brompton Cemetery is awash in them. There's an imitation-classical circular section surrounded by columns and featuring a rotunda reached by a wide promenade in which an entire host of angels is encamped. I snapped until my fingers stopped functioning in the biting wind.
It's an actual list! I'm not sure how many people in London know about it, as it's a term that was coined by an architectural historian. I think you'd have to have quite a strong interest in the history of London to know it. I wish I'd known about it sooner, but am quite grateful to have discovered it before I move away.
Embarrassingly, I've never been! It's The Necropolis, up behind the Cathedral. I believe it's quite something. Deer live there, up in the heart of the city. There was also the strange incident, in the 1950s, of hundreds of children found hunting a vampire with iron teeth there, which lead to the introduction of censorship laws in children's material such as comics.