geysers at yellowstone national park in wyoming,usa

travel steam nature wyoming yellowstone national park water hot spring outdoors geyser environment day destinations north america tourism unesco world heritage site blue summer algae geology upper basin forest volcano rock object public steamed landscape scenery geothermal reserve multi colored yellow scenics flowing stone heat temperature famous place nonurban scene beauty volcanic idyllic people thermal pool extreme terrain majestic closeup backgrounds environmental conservation textured effect formation physical geography