Nebraska

Historic Chadron.  Photos and brief descriptions of many historically significant structures in this western Nebraska town, with maps.  [ccr]
http://www.chadron.com/history/map.php

Downtown Lincoln.  Hundreds of photos are accessed by navigating from place to place.  Includes the state capitol.  [ccr]
http://db.4w.com/lincolntour/ 

Route 6.  A map-based tour of the longest U. S. transcontinental highway, put together by three geographers and supported by Augustana College.  Includes a history of the route and scores of photos of scenes along the route from Provincetown, at the tip of Cape Cod in Massachusetts, to Long Beach, California.  [ccr]
http://www.augustana.edu/academics/geography/department/route6/index.html

Union Pacific Grand Excursion of 1866.  The story of the excursion to the 100th meridian with stereoscopic views by John Carbutt.  Click on "Union Pacific Archives in Omaha," near the bottom of the page, for more Carbutt stereo views of the event.  By the National Stereoscopic Association, Inc.  [ccr]
http://cprr.org/Museum/Stereo_World/Carbutt/