The town, the mine behind the farm and the logging area are all pop ups. I need to construct a platform of some kind to put the pop ups on when I remove them cuz the wife isn't always here to help and I don't want to crush other areas. There is track under the mountains along the wall. The mountains are removeable in sections to aid cleaning the track, etc. If I were to do it again, I would not put them against the wall as it is not easy to remove them nor to hide the seems.