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Dead lodgepole pine trunks, Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grand Prismatic Spring in winter, Lower Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

White sand beach. Puuhonua o Honaunau National Historical Park, Big Island, Hawaii, United States of America, Pacific

American bison covered in snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bull elk (Cervus canadensis), Rocky Mountain National Park, Colorado, United States of America, North America

Black Bear (Ursus americanus) sow climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Foggy sunrise at Sunrise Point with snow, Bryce Canyon National Park, Utah, United States of America, North America

Pronghorn (Antilocapra americana) buck in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Brown Bear (Ursus arctos horribilis) running through water, Katmai National Park and Preserve, Alaska, United States of America, North America

Bull elk (Cervus canadensis), along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

A view of the eastern portion of Death Valley National Park, California, United States of America, North America

A view of Mosaic Canyon Trail in Death Valley National Park, California, United States of America, North America

The red water of Lithodendron Wash, red from bentonite clay, in Petrified Forest National Park, Arizona, United States of America, North America

The red water of Lithodendron Wash, red from bentonite clay, in Petrified Forest National Park, Arizona, United States of America, North America

Hoodoo rock formations from the Fairyland Trail, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoo rock formations in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoo rock formations from the Fairyland Trail, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoo rock formations in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Black bear (Ursus americanus), Yellowstone National Park, Wyoming, United States of America, North America

Sun setting over the Teton Range at Moulton Barn, Grand Teton National Park, Wyoming, United States of America, North America

First light on the Grand Tetons with reflection at Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America, North America

Bighorn Sheep (Ovis canadensis) ram in the snow, Yellowstone National Park, Wyoming, United States of America, North America

The Cliff Palace Indian dwelling, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Panorama of Teton Range at first light, Grand Teton National Park, Wyoming, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Setting sun through Delicate Arch with sunburst, Arches National Park, Utah, United States of America, North America

Badlands through the window, Badlands National Park, South Dakota, United States of America, North America

Swiftcurrent Lake at sunset, Glacier National Park, Montana, United States of America, North America

Willow Ptarmigan (Lagopus lagopus), Katmai National Park and Preserve, Alaska, United States of America, North America

Petroglyph near Chetro Ketl, Chaco Culture National Historical Park, New Mexico, United States of America, North America

Cholla Cactus Garden, Joshua Tree National Park, California, United States of America, North America

Upper Yosemite Falls, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

Blackbrush (Coleogyne ramosissima) blossom, Arches National Park, Utah, United States of America, North America

Sunrise on the shore of Lake McDonald, Glacier National Park, Montana, United States of America, North America

Mountain bluebird (Sialia currucoides), male at nest cavity, Yellowstone National Park, Wyoming, United States of America, North America

Lone evergreen tree in the snow with a meandering stream, Grand Teton National Park, Wyoming, United States of America, North America

Townsend's Solitaire (Myadestes townsendi), Yellowstone National Park, Wyoming, United States of America, North America

Uinta ground squirrel (Urocitellus armatus), Yellowstone National Park, Wyoming, United States of America, North America

View of Hermit Canyon and Hermit Basin from the Boucher Trail at Grand Canyon with Pima Point on the upper left, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Black Bear (Ursus americanus), two chocolate cubs of the year or spring cubs, Yellowstone National Park, Wyoming, United States of America, North America

Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

View over the Vernal and Nevada Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Hiking the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Mist over the Fairweather Range, Icy Strait, between Chichagof Island and Glacier Bay National Park, UNESCO World Heritage Site, Inside Passage, Alaska, United States of America, North America

A view of the Aialik Glacier, coming off the Harding Ice Field, Kenai Fjords National Park, Alaska, United States of America, North America

Yosemite Valley and Bridalveil Fall from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Half Dome and Yosemite Valley viewed from Glacier Point at dusk, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Thunderstorms over south rim, from Cape Royal, north rim, Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Schwabacher landing, Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

Oxbow Bend, Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hall of Mosses rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Ruby Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Yosemite Valley Chapel, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

View of the braided river leading to Crescent Lake in Lake Clark National Park, Alaska, United States of America, North America

Early light on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Joshua tree (Yucca brevifolia), at night in Joshua Tree National Park, Mojave Desert, California, United States of America, North America

Hikers in Havasu Creek, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Ancestral Puebloan ruin at Desert View on the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A view of the hoodoos from the Rim Trail in Bryce Canyon National Park, Utah, United States of America, North America

A view of the Bryce amphitheater from the rim at Bryce Canyon National Park, Utah, United States of America, North America

Court of Patriarchs, Zion National Park, Colorado Plateau, Utah, United States of America, North America

A valley in Petrified Forest National Park, west of the Tepees, Arizona, United States of America, North America

An adult harbor seal (Phoca vitulina) hauled out on the rocks in Kenai Fjords National Park, Alaska, United States of America, North America

An adult female bighorn sheep (Ovis canadensis nelsoni), in a cave for shade in Grand Canyon National Park, Arizona, United States of America, North America

Night photography at South Canyon, just before river mile 32, Grand Canyon National Park, Arizona, United States of America, North America

Whiskey Flat rock formation on sunny day, Capitol Reef National Park, Utah, Western United States, USA

Kanarra Creek hiking trail through slot canyon, Kolob Canyons section of Zion National Park, Utah, Western United States, USA

An adult golden-mantled ground squirrel (Callospermophilus lateralis), in Bryce Canyon National Park, Utah, United States of America, North America

Bryce Canyon from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Grand Canyon view from cliffs east of the Desert View Point, with Cedar Mountain in the distance on the right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America