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A mouse click on the map below will open the interactive Sherlock Holmes map created by Thomas Bruce Wheeler. The map is one of the electronic features in his book, "The Mapped London of Sherlock Holmes" (Amazon, $5.99 & $13.99). The map's legend also identifies several "in Sherlock and Watson's footsteps" walking tours.

In using the map below, you can collapse its legend by clicking on the small vertical three-dot symbol. Then, a click on one of the small Sherlock Holmes silhouettes will open an illustrated text box explaining the Sherlockian significance of that place, and in which of the Canon's sixty adventures it was mentioned. If you what to see that place in modern London, click on the illustrated text box's small diamond symbol. This will generate a new map with only that place marked. After zooming in, 
click on this new placemark until a small modern photo appears in the text box. A click on this small photo will open it to full screen. Your mouse wheel can then be used to convert the photo to an aerial view.

The Mapped London of Sherlock Holmes also references the Scottish National Library website that produces a Victorian overlay map showing the 1895 streets and buildings Sherlock "knew". 

T he Mapped London of Sherlock Holmes,  (Amazon, $5.99, $13.99) is the culmination of a thirty-year effort to identify all of the Sherlock Holmes sites in London, and provides several "in Sherlock and Watson's footsteps" walking tours.  In addition to the interactive map, the book has GPS addresses to allow London visitors to get from one site to the next with a GPS app. The book's other features are covered in the slide show above. As said by the Sherlock Holmes Society of London, in their Summer 2018 Journal, "As a ... guide to the London of the Canon, (this book) is unbeatable."