Maryhill Museum of Art 

 What:   On the beautiful view of the Columbia River Gorge, a deli, gift shop, picnic grounds, sculpture gardens, art museum and peacocks with large tails and calls that can be heard near a mile away. Sculptures by Rodin, American and European paintings, International chess sets, Native American artifacts, Romanian Icons/Faberge artifacts, Theatre de la Mode French fashion miniatures, Queen Marie of Romania royal regalia, and Samuel Hill memorabilia. It is on the Lewis & Clark trail. Stonehenge replica is only a mile away. Open daily 9am-5pm from March 15 through November 15. I've had more fun at this museum than any other I've ever visited. Rock art.
Official Maryhill Museum website
 Where:  Take I90 West to Ritzville and then take 395 south to the Tri-cities. Continue on 395/82 to near the Columbia river and then take 14 on the Washington side. Maryhill is before Dalles.
 Cautions:  Phone: 509-773-3733, call to verify hours. Photos are allowed without use of any flash.
 List:  Also see Columbia Gorge Hotel, Beacon Rock, Horse Thief Lake, Stonehenge, nice map, & Klickitat County for additional stops along this beautiful drive.