London knew by Sherlock Holmes

London at the start of 1900 wasn't has we know it now. 
Thomas Bruce Wheeler has created this map of Sherlock Holmes's London. There are almost 400 sites identified in his map.

He has created hyperlinks to street-view photos, and GPS addresses to provide walking directions with your smart phone's GPS app. 
A virtual tour in the Sherlock Holmes's locations.

There you can find also all the fictional and real locations in which are set the stories (So while you are reading the analysis you can use this map to orientate)