WALLA WALLA—Admission to the Fort Walla Walla will be free on Sun., April 14 from 10 a.m. – 5 p.m. for the museum Open House. This is a chance for area residents to see what is new at the old fort. The museum boasts five exhibit halls and a 17-structure pioneer settlement. Learn about the territorial prison, horse-era agricultural practices, the history of Fort Walla Walla and more.