While driving from Spokane to Seattle on I-90, there is a wild horse monument on top of one of the plateaus in Vantage (actually it's technically in George, but you see it as you drive through Vantage). I always look for it but have never stopped to check it out. Last weekend we did stop, disregarding the "Monument Closed" sign and a chain across the entrance. It was a bit of a hike to the top but well worth it, and the fading light and early moon rise was surprisingly good for a bunch of phone pics!