Yesterday I posted a picture of the Tent of Tomorrow from the 1964-1965 New York World's Fair. The tent is famous for containing a giant map of New York State on the floor. I believe that was the largest map ever created, at least up to that point. An earlier fair also had a giant map, though. This view is of a 3D map of Belgium as seen at Expo 58. It would be interesting to know if any pieces of it still survive.