I will be teaching a survey course in U.S. History to 1877 in fall.  I am considering assigning a project for students to assess a public history experience (historic houses, battlefields, volunteer w/a public archeology program, etc.) and thought of websites that provided enough material to equate with physically visiting a location.  I realized that my "recommended" list is heavily weighted to the Middle Atlantic, because of my familiarity with the regional history and historic archeology.    

In an effort for geographic diversity, can anyone recommend favorite web sites, appropriate for such a class assignment?  

Thanks in advance.
Chris