yellowstone national park entrance sign near the roosevelt arch at gardiner, montana, usa

afternoon altitude america american and arch ascends before blue colorful colors entrance evening for fort gardiner geothermal heritage hills hillside hot just landscape late light main mammoth montana mountain mountains national natural nature north of outdoor outdoors palette park past 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