Useful Links
Many of the web sites below provide more links to additional preservation information.
The National Register of Historic Places is a program is administered by the National Park Service. Wikipedia also lists all of the National Register properties (click the [Map of all coordinates] link at the upper right corner of the table to see a map of the site locations).
Washington State Department of Archeology and Historic Preservation (DAHP). The Department of Archaeology and Historic Preservation is Washington State's primary agency for the preservation of Washington’s irreplaceable historic and cultural resources – significant buildings, structures, sites, objects, and districts.
National Trust for Historic Preservation