For a trip into central Washington, Goldendale with what my son and I call Faux Henge and a wonderful solar observatory (I've seen the rings on Saturn!) is just above the Columbia River.
A little down the way is the Maryhill Museum. You ever hear the expression "What in the Sam Hill are you doing" well Sam was building Faux Henge and the Maryhill collection which could be named for either his wife, daughter, or mistress
https://www.atlasobscura.com/places/...and-stonehenge