Stonehenge Replica, War Memorials, Goldendale Observatory
Washington & Oregon State Parks in the general vicinity
From Portland, OR you can travel I-84, Hwy 14, or a combination.
Depending on whether you are in a hurry, want to take the slower scenic route, or some combination of the two, you can travel I-84 on the Oregon side (faster), and/or Hwy 14 on the Washington side (more curvy). Both highways are scenic. You can cross the Columbia River from Portland via the I-5 bridge or the I-205 bridge, the Bridge of the Gods 40 miles east of Portland ($2 toll each way), the Hood River Bridge ($2 toll), The Dalles bridge (US Hwy 197), and US Hwy 97 crosses the Columbia River closest to the Maryhill Museum of Art.
Eats and Sleeps
Beside the little café at the Museum, you can find food and/or rooms--
Biggs Junction at I-84 and Hwy 97:
Goldendale 15 miles north of Maryhill Museum of Art, Hwy 97
I've been in a wheelchair for 30+ years. It poses some challenges for traveling. Maybe others can benefit from my experiences.