The 221B Baker Street museum is located in London, England and is dedicated to the famous fictional detective Sherlock Holmes. The museum is situated in a building that has been designed to look like the fictional residence of Holmes and his assistant Dr. Watson.

The museum features several rooms that are furnished and decorated in the Victorian style. Each room is dedicated to a different aspect of the fictional character's life, including his study, bedroom, and sitting room. The museum also contains a collection of memorabilia related to the character, including original manuscripts and other artifacts.

Visitors to the museum can take a guided tour, during which they can learn more about the life and work of Sherlock Holmes and the fictional world he inhabited. The museum is a popular destination for fans of the character and the many adaptations of his stories that have been made over the years.