You are going to join an exciting tour of the Sherlock Holmes Museum at 221B Baker...

Question

You are going to join an exciting tour of the Sherlock Holmes Museum at 221B Baker Street. What do these dates and numerals mean?помогите

Answer 1

Daker street is a name of the street, where is Sherlock's Museum stay.
And #221b is a number of the building for Sherlock's Museum on Baker Street.