This weekend, fans of the BBC/PBS series Sherlock eagerly await Season 3′s final episode, starring Benedict Cumberbatch as the famous consulting detective. Although I haven’t seen the show (despite the impassioned urging of several friends), I have seen something rather personal of Mr. Holmes…

He’s one of the world’s most famous detectives with one of the most famous addresses in literature: 221B Baker Street, London. Sherlock Holmes’ fictional address is the real address of the Sherlock Holmes Museum.

He’s one of the world’s most famous detectives with one of the most famous addresses in literature: 221B Baker Street, London. Sherlock Holmes’ fictional address is the real address of the Sherlock Holmes Museum. In summer 2013, I waited in line for two hours (including two brief rain storms) to tour the townhouse of this fictitious figure. The...