Address: 28728 Green River Road S, Auburn. Located on a fertile shelf of land adjacent to the Green River known as Olson Canyon, the Olson Farm was initially developed by Swedish immigrants Alfred and Mary Olson and later farmed by Mary's second husband, Eric Magnus Johnson and Alfred and Mary's children. Because so many of the original structures remain in place, venturing into the canyon is like walking back in time. The farm ensemble includes a one and a half-story frame farmhouse built in 1902, a gable roof barn built in 1897, a weaving shed, workshop, smokehouse, and orchard. The City of Auburn acquired the 60-acre site in 1994 through the King County Open Space Program.