Old Faithful Geyser, daww eruption. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49308.html Lewis River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49230.html Plume, Old Faithful geyser, winter night. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49306.html Old Faithful Geyser at dawn. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49309.html Colorful thermal stream and dark clouds, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49249.html Thermal steam along the Firehole River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49281.html Thermal stream at edge of Yellowstone Lake in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49248.html Snow-covered bison in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49251.html Burned tree trunks and snow, Lewis Canyon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49237.html Castle geyser cone and steam in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49254.html Thermal run-off stream contrasts with snowy landscape. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49265.html Moose Falls in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49234.html Close up of tree with snow. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49341.html Thermal pool and dark clouds, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49245.html Forest with snow falling. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49349.html Lewis Falls in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49238.html Mustard Spring. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49327.html Bare trees and steam in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49264.html Chromatic Spring in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49266.html Herd of buffaloes during snow storm. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49285.html Grotto Geyser at dusk. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49333.html Snowy landscape with waterfall. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49233.html Lewis Canyon slopes with burned forest, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49236.html West Thumb Geyser Basin in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49250.html Trees on edge of Lewis Lake in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49345.html Firehole river and bison in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49258.html Run-off and geyser, steam obscuring moon, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49304.html Pine forest in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49346.html Lone bison and thermal steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49317.html Plume, long night exposure, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49305.html Snow-covered trees. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49278.html Lewis River valley in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49240.html Forest in snow storm. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49348.html Bisons with thermal plume behind in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49315.html Old Faithful geyser plume in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49312.html Bison following warm stream in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49263.html Pine tree and Old Faithful geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49311.html Winter landscape with thermal run-off. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49255.html Upper Geyser Basin in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49259.html Steam rising from pool in winter, West Thumb. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49244.html Hot springs and snow, Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49267.html Snow-covered branches. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49279.html Mirror Pool, snow and steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49331.html Sapphire Pool in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49324.html Tree skeletons in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49257.html Crested Pool in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49253.html Snowy landscape with distant thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49262.html Snow-covered spruce trees. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49280.html Morning Glory Pool, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49282.html Wintry forest and steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49319.html Snow-covered West Thumb thermal basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49246.html Lewis River and falls, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49239.html Bison moving in single file next to Firehole river, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49256.html Snowy forest and Kepler Cascades. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49339.html Frosted tree and thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49325.html Thermal run-off and snowy landscape. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49247.html Bison and Lion Geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49252.html Thermal pool in winter, West Thumb Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49243.html Tree skeleton and thermal steam, Biscuit Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49330.html Kepler Cascades of the Firehole River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49340.html