Ключевые слова: adventure, beautiful, bison, buffalo, fumarole, fumaroles, geological, geology, geothermal, geysers, hikers, landscape, mud volcano, national, national park, nature, outdoors, people, scenery, scenic, sitting, sky, steam, summer, taking photos, thermal, tourism, tourists, trails, travel, united states, usa, vapor, wildlife, wyoming, yellowstone, yellowstone national park,