Wooden boardwalk over the mineral sinter formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

adult algae blue sky boardwalk cloud color image day environment five people formation geyser hill horizontal hot spring mineral mineral sinter formations national park nature north america outdoors people photography remote rock sinter steaming tourist tourist attraction travel travel destinations unesco world heritage site united states upper geyser upper geyser basin wooden wooden boardwalk wyoming yellowstone yellowstone national park america american americas color colour daytime isolation outside park promenade seclusion sightseeing sky steam stone tourism us usa united states of america us usa water wy