Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

adult algae boardwalk cloud color image day environment grand prismatic spring heat horizontal hot spring medium group of people midway geyser midway geyser basin mineral runoff national park nature north america outdoors people photography remote steaming tourist tourist attraction tourists travel travel destinations unesco world heritage site united states woman wyoming yellowstone yellowstone national park america american americas color colour daytime female hot isolation outside park person promenade seclusion sightseeing steam tourism us usa united states of america us usa water wy