This is one of <i>many</i> interesting things hiding in the stacks of the maps division of the LOC, if you ever get an opportunity for a private tour - though I'm not sure if every one of those dips into the vault.<p>My strongest memory is of the WW2 Normandy beaches invasion map, done as an architectural model. Also, in the reading room, they keep a personal presidential globe - <a href="http://www.loc.gov/exhibits/churchill/interactive/_html/wc0001_3.html" rel="nofollow">http://www.loc.gov/exhibits/churchill/interactive/_html/wc00...</a>