yellowstone national park with gardner river valley near north entrance at gardiner in evening light, montana

afternoon altitude america american arch ascends blue colorful colors entrance evening fort gardiner geothermal heritage hills hillside hot landscape late light main mammoth montana mountain mountains national natural nature north outdoor outdoors palette park plateau river road rocky roosevelt sign sky spring springs states structures sun sunlight tectonic terrace terraces travertine trees unesco united upper usa valley volcanic water west western white wild wilderness world wyoming yellowstone gardner site site