Castle Valley, Utah - Professor Valley Ridge Watch for gigantic rock formations on top of this ridge. From north to south: Convent, Sister Superior, Priest and Nuns, The Rectory, Castle Rock. Upper Colorado River Scenic Byway Follow the mighty Colorado River through its beautifully carved redrock gorge and travel back 250 million years in time. If it all looks familiar, it may be that you recognize the scenery from several western movies and commercials.