Encyclopedia of Washington history offers articles and searchable bibliographies.

Explores the history of Seattle with descriptions and images of historic buildings, ships, monuments, and areas.

Organization for preservation efforts for the Kalakala, an Art Deco ferry in service in Puget Sound in Washington state from 1935 through the mid-1960s. Illustrated timeline, description and virtual tour of the vessel.

Collection of historical photos from the 19th and 20th centuries that portray people, places, and events in the county's urban, suburban, and rural communities.

Mountaineers Climbs 1912-1916. Photographs from climbing in the mountains of Washington state.

Includes information about the Washington Territorial Commission; a collection of searchable databases, including census data; a territorial timeline with photographs and documents; upcoming events.

The mission Marcus and Narcissa Whitman established along the Oregon Trail near Walla Walla, Washington. Information about activities, lodging and fees, a virtual tour of the mission, and a printable map and travel guide.

Digital collection of maps relating the history and development of the area that eventually would become Washington state. Includes a timeline of early Washington maps.

Information about the organization, its permanent and traveling exhibits, Columbia magazine.