Hart's Pass is the highest road in Washington State and is one-lane with dirt and gravel, steep cliffs, and no guard rails. Simply put, if you suffer from anxiety and fear heights, this is not a road for you.
Not many locals know the story of the USS Triton (SSRN 586) submarine sail and how its superstructure ended up in Richland or that you can schedule a guided tour inside the original conning (raised platform tower) and control room.