Wooden boardwalk and cyanobacteria thermophile formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

algae boardwalk color image cyanobacteria cyanobacteria thermophile formations day environment formation geyser hill hot spring national park nature nobody north america outdoors photography remote rock steaming thermophile travel travel destinations unesco world heritage site united states upper geyser upper geyser basin vertical wooden wooden boardwalk wyoming yellowstone yellowstone national park america american americas color colour daytime isolation outside park promenade seclusion steam stone us usa united states of america us usa water wy