The map below is one of the many electronic features in Thomas Bruce Wheeler's
The Mapped London of Sherlock Holmes, available at Amazon and Barnes & Noble. You can preview the full Interactive map by clicking one of its Sherlock Holmes symbols. The legend on the left side of the map can be collapsed by clicking on the legend's small vertical three-dot symbol. Then, a mouse click on any of the map's Sherlock Holmes figures will open an illustrated text box explaining the Sherlockian significance of that place.
The Mapped London of Sherlock Holmes provides a map of Victorian London, and the streets Sherlock Holmes "knew". The ebook also has the capability of producing street-view photographs of each Sherlockian site in modern London, and for visitors, provide walking instructions from one site to the next by using a smart phone's GPS app. A mouse click on the book's cover below, will link to Amazon.com. There, their "Look inside" feature will allow you to preview the book's computer app features.