Walla Walla County Washington (Historic Districts) has 4 places on the National Register of Historic Places including 1 place of National significance and 2 places of Statewide significance. Significant places include Fort Walla Walla Historic District, Lower Snake River Archaeological District and Windust Caves Archaeological District, Waitsburg Historic District.
Prehistoric cultural affiliation(s) include Cayuse and Windust Phase dating back to 8999 BC. Prominent architectural styles found in Walla Walla Country are Second Empire.