ScientificAmerican1884-03-15.jpg Scientific American 1884-03-08ThumbnailsScientific American 1884-03-22Scientific American 1884-03-08ThumbnailsScientific American 1884-03-22Scientific American 1884-03-08ThumbnailsScientific American 1884-03-22Scientific American 1884-03-08ThumbnailsScientific American 1884-03-22Scientific American 1884-03-08ThumbnailsScientific American 1884-03-22

The viaduct over the Mississippi River at the Falls of St. Anthony. Minneapolis and St. Paul, the Twin Cities, Minnesota.