Old Faithful Geyser, late afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8806.html Great Fountain geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0538.html Old Faithful Geyser erupting, backlit by late afternoon sun. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8807.html Old Faithful Geyser erupting, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8809.html Steam column from Old Faithful Geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell6021.html Steam clouds drifting from Old Faithfull geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0508.html Castle Geyser in Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2242.html Daisy Geyser erupting at an angle. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8793.html Grand Geyser, tallest of the regularly erupting geysers in the Park. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8798.html Grand Geyser eruption, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8799.html Great Fountain geyser eruption. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0517.html Old Faithful Geyser and tree backlit in afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21262.html Old Faithful Geyser and tree, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21261.html Old Faithful geyser and tree. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25456.html Old Faithful geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25453.html Old Faithful Geyser in the winter with moon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49302.html Pine tree and Old Faithful geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49311.html Old Faithful Geyser, daww eruption. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49308.html Bison and Lion Geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49252.html Old Faithful geyser, moon and clouds. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49307.html Old Faithful Geyser at dawn. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49309.html Old Faithful geyser plume in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49312.html Plume, long night exposure, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49305.html Plume, Old Faithful geyser, winter night. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49306.html Old Faithful Geyser eruption and moon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49300.html Old Faithful Geyser erupts at night. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49301.html Night view of Old Faithful Geyser in winter with full moon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49303.html Run-off and geyser, steam obscuring moon, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49304.html Grotto Geyser at dusk. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49333.html