From Washington State Parks:
Maryhill State Park is a 99-acre camping park with 4,700 feet of waterfront on the Columbia River in Klickitat County. The area is significant for its natural beauty, its access to the surrounding natural wonders and its cultural history. A full-scale model of Stonehenge stands near the park.
More Info: http://www.parks.wa.gov/parks/?selectedpark=Maryhill