Searching for giant us raised contour map.

I once saw an article(I believe in National Geographic) about a giant raised contour(or raised relief) map. It was representative of a person looking down from about 400 miles in space. I believe(old neurons failing<G>) that the map was on an Eastern University campus in a small building built just to house it. The map was HUGE!! It had fallen into disrepair with campus kids picnicking on the plains states! The article said that it was being restored. Does anyone have any info? It seems like it would be a 'musr see'.