By the time Bricks was released the Devs where just focused on everything that a person would interact with. They totally dropped trying to make the zones looks larger on the other side of the War Walls.
Not sure if it has been cleaned up yet or not but Eden and The Hive used to have 3D items piled up on the back side of the War Walls in those zones. The Devs must have set them down to place and had to stop work before they where finished. The original AP used to have a Compass behind the War Walls to tell the Devs what way was North, South, East, and West.
Back in the day Faultline had a hole in the Dam. I used to fly back of the War Walls for hours looking at the 2D and 3D models. Some zones had 2D models that went back three or more City Blocks.