Old Faithful Geyser, late afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8806.html Family looks at thermal pool in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49326.html Tree skeletons in Black Sand basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0509.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 Steam out of Beauty pool in Upper geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0507.html Large group of tourists in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49329.html Old Faithful Geyser, daww eruption. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49308.html Old Faithful geyser plume in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49312.html Mirror Pool, snow and steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49331.html Green and red algaes in Norris geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0505.html Minerva travertine terraces, Mammoth Hot Springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21263.html Frost along the Firehole River. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8824.html Midway Geyser Basin along the Firehole River. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8810.html Photographer standing next to hot springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49260.html Thermal pool, upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21274.html Trees near Fountain Paint Pot at sunset. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2251.html Bison and Lion Geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49252.html Blue clear waters in Sapphire Pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21272.html Steam rising in thermal geyser basin a dawn. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25446.html Hiker at Morning Glory Pool, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49283.html Snow-covered bison in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49251.html Bisons and geyser cone, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49276.html Thermal scenery with hot springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25452.html West Thumb Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2241.html Buffalo herd and Geyser Hill in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49316.html Great Fountain Geyser with residual steam at sunset. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21268.html Steam and forest in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49320.html Old Faithful Geyser and tree backlit in afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21262.html Gem pool seen from above, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49321.html Bisons with thermal plume behind in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49315.html Grotto Geyser at dusk. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49333.html Minerva travertine terraces at Mammoth Hot Springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0520.html Great Fountain geyser and colorful clouds at sunset. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2250.html Old Faithful Geyser eruption and moon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49300.html West Thumb geyser basin and Yellowstone lake. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21270.html Thermal stream at edge of Yellowstone Lake in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49248.html Group of buffaloes crossing river in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49272.html Old Faithful Geyser in the winter with moon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49302.html Great prismatic springs, thermal steam, and hill, Midway geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0514.html Fishing cone, fog, and sun rising. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21269.html Thermal travertine terraces. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25450.html Thermal pool in winter, West Thumb Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49243.html Skiers and thermal steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49269.html Raibow colored Morning Glory Pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21275.html Thermal pond and dead trees. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25448.html Sapphire Pool, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21271.html Two American bisons in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49273.html Plume, long night exposure, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49305.html Firehole river and bison in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49258.html Flowers on slope below Mt Washburn, sunrise. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21258.html Fumeroles and forest in Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2246.html Mustard Spring. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49327.html Old Faithful Geyser erupting, backlit by late afternoon sun. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8807.html Grand Geyser eruption, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8799.html Morning Glory Pool, midday. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8794.html Great prismatic springs, Midway geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21267.html Morning Glory Pool with hikers. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8795.html Old Faithful geyser and tree. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25456.html Steam in Norris Geyser Basin at dawn. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21266.html Thermal basin with multi-colored algae. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25451.html Dead trees and turquoise pond in Norris Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21265.html Chromatic Spring in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49266.html Steam rising from pool in winter, West Thumb. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49244.html Thermal landscape with pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25449.html Tree skeleton and thermal steam, Biscuit Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49330.html Turquoise thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25455.html Snow-covered West Thumb thermal basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49246.html Travertine formations in Upper geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0510.html Great Fountain geyser eruption. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0517.html Great Fountain geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0538.html Mud cauldron at fountain paint pot. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0518.html Landscape with thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25458.html Travertine terraces and steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25457.html Bright colors of morning Glory Pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8796.html Thermal steam and frosted trees. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0515.html Geyser cone in Upper geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0511.html Colorful algaes patterns, Biscuit Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8804.html West Thumb Geyser Basin covered by snow at dusk. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2243.html Pools, West Thumb geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0521.html Old Faithful Geyser erupting, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8809.html Old Faithful Geyser and tree, afternoon. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21261.html Travertine terraces at Mammoth Hot Springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2252.html Thermal run-off and snowy landscape. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49247.html Hot springs and snow, Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49267.html Detail of colorful algaes, Biscuit Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8803.html Old Faithful Geyser at dawn. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49309.html Castle geyser cone and steam in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49254.html Steam clouds drifting from Old Faithfull geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0508.html Thermal activity at Norris geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0504.html Colorful streak and terraces, Great Prismatic Springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21338.html Bison crossing Firehole River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49271.html Tourists walk over snow-covered boardwalk. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49328.html Giant Geyser cone and steam in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49270.html Yellow mineral deposits in a hot springs, Midway Geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell5910.html Winter landscape with thermal run-off. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49255.html Trees shadowed in thermal steam, Upper geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0506.html Crested Pool in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49253.html Thermal run-off stream contrasts with snowy landscape. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49265.html Old Faithful geyser, moon and clouds. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49307.html Grizzly bear and thermal steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell1838.html Pine tree and Old Faithful geyser in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49311.html Colorful thermal stream and dark clouds, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49249.html Thermal pool and dark clouds, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49245.html Castle Geyser in Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2242.html Lone bison and thermal steam. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49317.html Terraces in Great prismatic springs, Midway geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0513.html Upper Geyser Basin in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49259.html Snowy landscape with distant thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49262.html Old Faithful Geyser erupts at night. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49301.html Daisy Geyser erupting at an angle. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell8793.html Steam and hill, Midway geyser basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0516.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 Norris geyser basin at sunrise. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell0503.html Old Faithful geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25453.html Minerva travertine terraces and steam, Mammoth Hot Springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21264.html Run-off and geyser, steam obscuring moon, Old Faithful. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49304.html Bare trees and steam in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49264.html Hot springs detail. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49261.html Morning Glory Pool, winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49282.html Sapphire Pool in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49324.html Steam rising in geyser pool at sunset. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25447.html Skier at the edge of thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49332.html Lewis River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49230.html Frosted tree and thermal pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49325.html Beauty Pool. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell21273.html Thermal steam along the Firehole River in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49281.html West Thumb Geyser Basin in winter. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49250.html Bisons with snowy faces. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49274.html Steam column from Old Faithful Geyser. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell6021.html Plume, Old Faithful geyser, winter night. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell49306.html Steam rising from multi-colored thermal springs. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell25454.html Chromatic Pool in Upper Geyser Basin. Yellowstone National Park, Wyoming, USA. http://www.terragalleria.com/parks/np-image.yell2245.html