Tourists standing on the edge of Grand Prismatic Spring, Yellowstone National Park, Wyoming, United States, North America

calc sinter calcareous sinter daylight daytime day exterior views exterior view famous place geothermal power geothermal spring geothermal geothermic energy geothermic grand prismatic spring hot spring hot landscape shot landscapes landscape many people mineral national parks national park natural landmarks natural landmark natural preserves natural preserve nature reserves nature reserve nature north america people person place of interest protected area reserves reserve rock layer rock stratums rock stratum rural sanctury sedimentary rocks sedimentary rock sedimentation sediments sediment sights sight sinter source springs spring thermal springs thermal spring tourism tourists tourist travel photography travel united states of america united states us america usa us wyoming yellowstone national park