In Neverwhere, the characters are constantly moving through London. The characters are underground for most of the story, which makes it difficult to figure out exactly where they are. As I was researching, I came across a google map that someone had made to show the characters' journey. This map was by far the most accurate and in depth one that I could find.
WARNING: This map does contain spoilers for those of you who have not yet read Neverwhere!
http://maps.google.co.uk/maps/ms?ie=UTF8&oe=UTF8&msa=0&msid=217482003647292529041.00049ed40b0fc6f0108e2
