Talking of odd entrances....
This is the entrance to the Crown Court Church of Scotland. Now, it's not a crown, it's not a court, but it is a church. And yes, the entrance really is through the side of the Fortune Theatre.
This church is right in the heart of Theatreland, only 50 yards from Drury Lane, and has been there for hundreds of years. I love the thought of the Elizabethan clerics able to slide out to the local bawdy houses (because that was what there was around there) when the feeling took them, as no doubt it did. I think that it must have got its name becaue it is also around the corner from the Bow Street Court, which is what gave its name to the Bow Street Runners, who turned into "Peelers" and then the Metropolitan Police.
I think that the Bow Street Runners may well have been the inspiration for the City Watch in Terry Pratchett's books. A raggle-taggle bunch of people who ended up keeping the law because, well, that was what you did.