Wyoming

Tales and Trails.   A large collection of Historic Photos indexed by place in Wyoming.  Part of a larger Wyoming Web site with many interesting features.   [ccr]
http://www.wyomingtalesandtrails.com/bighorn.html

Historic Downtown Sheridan.  Photos and historical descriptions of 31 buildings, accessible from a nice map.  [ccr]
http://www.sheridanwyoming.org/downtown.shtml

Oregon-California Trails Virtual Tours.  Tours of the California, Oregon, and Cherokee Trails, especailly crossing Wyoming.  Some require Quick Time.  Created by the Oregon-California Trails Association.  [ccr]  
http://www.octa-trails.org/learn/virtual_trail/index.php