"Some interesting patterns emerge. Naturally, there's plenty of action around the Baker Street area, but Holmes never once set foot in nearby Soho. Zooming out, there's a surprising cluster of incidents around Crystal Palace. The reason is elementary when you know that Conan-Doyle lived for a time in South Norwood. We haven't plotted the numerous out-of-town locations mentioned in the books, but you can get a sense of Holmes' peregrinations by noting which rail stations he used most. Southern stations Charing Cross and Waterloo are visited a combined total of 16 times, while King's Cross and Euston are only blessed with the detective's patronage on four occasions."