Tourists on boardwalk, Grand Prismatic Spring, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

america american area areas attraction attractions bacteria basin boardwalk colored conservation day daylight daytime during energy exterior exteriors famous geothermal geothermic geyser geyser geysers grand hot hot spring hot springs known microorganisms midway national national natural nature nobody north of on outdoor park park parks photo photos power preserve preserves prismatic renowned reserve reserves sanctuaries sanctuary seeing shot shots sight sights site sites source sources spring spring springs states steam steaming the thermal thermophilic tourist tourists united us us american usa well well known wells wildlife worth wyoming yellowstone