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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 The Mapped London of Sherlock Holmes, (Amazon, $5.99 & $13.95). The map's legend, on its left side, identifies several "in Sherlock and Watson's footsteps" walking tours.

If you just want to use the main map, you can collapse the legend by clicking on its 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. 
, keep clicking 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. If you have a problem with this, find the yellow Pegman on the lower right side of the map. Click and drag this to the new placemark. This will also generate a full-screen photograph. Your mouse wheel can then be used to convert the photo to an aerial view.

The Mapped London of Sherlock Holmes also references the Scotish 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, $13.95) allows you to explore the London of Sherlock Holmes. In addition to the custom interactive map, the book has the GPS addresses needed to get walking instructions from one site to the next with your smart phone's GPS App. The e-book version also generates street view photos of London's Sherlock Holmes sites. This book is a good way to electronically "visit" the great detective's London.