The White River Valley Museum tells the story of the Green River Valley from its Muckleshoot and Duwamish indigenous inhabitants through the pioneer settlement period, the Japanese American farming community, and the wartime history of the region. The collection includes a 1920s replica of a downtown Auburn street, period photographs and artifacts, and a reconstructed Hooverville shack from the Great Depression.
The museum's documentation of the Japanese American community is particularly strong and sobering. The valley was home to hundreds of Japanese American farm families before their forced removal to internment camps in 1942; the museum traces this history through photographs, personal effects, and oral histories. It's worth a couple of hours and is genuinely moving. Admission is modest and it's worth checking for temporary exhibitions.