All the 126 (annotated) places where Watson & Sherlock Holmes went in their 60 adventures.
Some places are fictional but in many times, location can be done by some pieces of geographical indication in the text (some clues !).
Most of the places are in London and around. Placemarks shows that Conan Doyle chose mostly south London.

Are you a Sherlock's fan ? Are you able to know in that adventure, Sherlock speak about his journeys in Tibet ? or in Chicago ? Do you know where he disapeared during many years ? And where he retired ?

special thanks to (and complete texts) :
http://www.sshf.com/
http://www.bakerstreet221b.de/canon/index.html
http://www.sherlock-holmes.org/atlas/sherlock_atlas.html
http://www.mapquest.com/maps/main.adp?country=GB
http://uk.multimap.com/map/home.cgi?client=public&lang=&advanced=&db=GB