This is the Forgeworld Imperial City Walls from the Forgeworld Display at GamesDay 2005.
You can see this is a huge piece of scenery, those are long barreled autocannons on the walls.
The entrance is certainly imposing and an Imperial BaneBlade can fit through those doors.
I do like this, but is it worth £625? Well from what I have heard they have been flying off the *shelves* at Forgeworld. This model took something like twelve days to make and paint.
I want two!