221B Baker Street

221B Baker Street is a renowned address in London, England, famous as the home and office of the consulting detective Sherlock Holmes and his chronicler, Dr. John Watson. Introduced in Sir Arthur Conan Doyle's first Sherlock Holmes story, "A Study in Scarlet" (1887), it quickly became synonymous with the detective's logical reasoning and forensic science.

The rooms occupied by Holmes and Watson were described as a suite on the first floor of a lodging house, above a flight of seventeen steps, owned by their landlady, Mrs. Hudson. The most frequently detailed room is the sitting room, characterised by two broad windows overlooking Baker Street. While Watson often described it as "cheerfully furnished," it was also prone to disarray due to Holmes's eccentric habits, including chemical experiments in one corner and correspondence pinned to the mantelpiece with a jack-knife.

At the time of its creation, 221B Baker Street was an entirely fictional address, as street numbers on Baker Street did not extend that high. Doyle is thought to have chosen a non-existent number to prevent any real residence from being impacted by the stories' popularity. However, in late Victorian London, Baker Street was a respectable and accessible high-class residential district, fitting for a consulting detective. The address has since transcended its fictional origins, becoming a cultural landmark that draws visitors and has even led to a real-world 221B Baker Street due to street renumbering, now home to the Sherlock Holmes Museum.