Another fascinating aspect of the Nelson era.
There was a smaller version in Birmingham at one end of New Street. But not much information about it has survived.
I have been to what may be the nearest modern equivalent. I was in Atlanta quite a few years ago and I saw an advert for something called the "Cyclorama" and I couldn't resist taking a look.
This website tells all about it i.e. it is a huge panorama painting of aspects of the American Civil War. You will see that it claims to be the largest painting in the world!
http://www.atlantacyclorama.org/To view it you sat in an area of seating and either the painting moved round the seats or the seats moved round within the painting. I can't for the life of me remember which. That shows how long ago it was/how my memory is deteriorating!!

Enough of that . . . . . !!
MB