West Norwood cemetery is a truly fascinating place. Of course, most people only go there for cremations and burials, and aren't generally in the mood for sight-seeing. According to Wikipedia:
Reckoned to hold the finest collection of sepulchral monuments in London, it features 66 Grade II and Grade II* listed buildings and structures, including a dedicated Greek Orthodox section with 17 listed mausoleums and monuments. It is one of the Magnificent Seven metropolitan lawn cemeteries of the Victorian era, and its extensive Gothic Revival architecture qualifies it as one of the significant cemeteries in Europe.