I look at a lot of websites that deal with Victorian London. Most of them are blogs, while others are instructional or educational. Either way, you can come across some pretty cool information. And so, a few years ago I discovered cabmen's shelters.
The purpose for them were to be rest stops for cabbies who worked very long days. The original idea was born when an upper crust gentlemen sent out a servant to find a cab. The servant found a large number of inebriated cabbies in a local bar, totally unfit to drive. The gentlemen came up with the idea for a place for the cab drivers to gather that kept no alcohol. Between 1875 and 1914 61 were built around London. They were constructed to be only the size of a carriage since they were often in the middle of main streets. That idea was somewhat negated if a dozen or so cabs were parked outside and taking up a lot of room. And since by law the cabbies couldn't leave their cabs there and go somewhere else, the area could get clogged up. (This photo here is obviously a later one as you can see an automobile parked among the cabs.)
The idea eventually spread to other parts of the world. Australia built some of their own, and Ireland did, too - the most famous of which was located at Butt Bridge in Dublin. That shelter was featured in a rather lengthy scene in Ulysses by James Joyce. The only other claim to fame for them is that it's possible that Jack the Ripper himself may have visited one using an alias. (Hell, it could have been his real name. No one really knows.) Outside of these two times you really won't find much about them in popular literature.
In time these structures became less necessary. More
The thirteen remaining shelters are scattered all over the city. Here are the locations:
Chelsea Embankment SW3 - close to junction with Albert Bridge, London
Embankment Place WC2 - close to the Playhouse Theatre
Grosvenor Gardens SW1 - to the west side of the north gardens
Hanover Square, London W1 - on the north side of the central gardens
Kensington Park Road W11 - outside numbers 8-10
Kensington Road W8 - close to the junction of Queen's Gate SW7
Pont Street SW1 - close to the junction of Sloane Street
Russell Square WC1 - Western Corner (relocated to here from Leicester Square)
St. George's Square, Pimlico SW1 - on the north side
Temple Place WC2 - opposite side of the road from the Swissötel Howard
Thurloe Place, Kensington SW7 - in the middle of the road opposite the Victoria and Albert Museum
Warwick Avenue, London W9 - centre of the road, by Warwick Avenue tube station
Wellington Place NW8 - near to Lord's Cricket Ground
That last one, at one mile away, was the one that (I believe) was the closest to 221b Baker Street. If I ever get to London it is the one I want to visit.
These little buildings have an interesting history. There are stories to be found about them all over the papers of the day, and it makes for a fun afternoon of research if the mood should strike you. If you decide to do so just remember that there were over 60 of them. Plan accordingly.