Skiers and bisons. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49287.html Backcountry skier at the base of Giant Sequoia trees, Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40247.html Backcountry skier climbs Dome de Chasseforet in the Vanoise Range, Alps, France. http://www.terragalleria.com/mountain/mountain-image.alps3003.html Backcountry skiiers and Giant Sequoia trees, Upper Mariposa Grove. Yosemite National Park, California, USA. http://www.terragalleria.com/parks/np-image.yose40262.html Approaching the Fournel Valley. Alps, France http://www.terragalleria.com/mountain/mountain-image.icec3232.html Matterhorn and glaciers at sunrise seen from Monte Rosa, Switzerland. http://www.terragalleria.com/mountain/mountain-image.alps3009.html Cross country skiers pass Chromatic Spring. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49268.html Cross-country skiing in the remote Upper Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40261.html Skiing towards the Clothespin tree, Mariposa Grove. Yosemite National Park, California, USA. http://www.terragalleria.com/parks/np-image.yose40257.html Backcountry skiers dwarfed by Liskam, Switzerland. http://www.terragalleria.com/mountain/mountain-image.alps3007.html Skiers and thermal steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49269.html Skiers in front of the tree named Faithful couple tree in winter. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40249.html Skier at the edge of thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49332.html Skier and Upper Mariposa Grove in winter. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40260.html Skiers approaching the California Tunnel Tree, Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40246.html Skiers at the base of tree named Faithful couple tree in winter. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40252.html Skiing past a giant Sequoia Tree in winter, Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40254.html Skiing couple in front of the Mariposa Grove Museum in winter. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40281.html Skiers pause near the characteristic Clothespin tree, Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40255.html Cross-country skiiers at the base of Giant Sequoia trees in Upper Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40263.html Cross-country skiers at the base of Giant Sequoia trees, Mariposa Grove. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose40248.html