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Adult mountain goat (Oreamnos americanus) on cliff face in Tracy Arm, Southeast Alaska, United States of America

Riding the bus along the 92 mile-long road into Denali National Park, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Sandy beach on Pettit Lake in a valley north of Sun Valley, Sawtooth National Forest, Idaho, United States of America, North America

Orange clouds at dawn over a tarn, San Juan National Forest, Colorado, United States of America, North America

A bright lightning bolt passing through a cloud and striking in the Gila Bend Mountains south of Arlington, Arizona, United States of America, North America

Ghost town of Bodie, Sierra Nevada mountain range, California, United States of America, North America

Moraine Creek (River), Katmai National Park and Reserve, Alaska, United States of America, North America

Early morning view of Sedona from Schnebly Hill Vista, Capitol Butte on the left and Wilson Mountain on the right, Sedona, Arizona, United States of America, North America

Grand Canyon view just below the summit of Buggeln Hill on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Mounds and cliffs of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

A large petrified log along the Blue Mesa Trail in Petrified Forest National Park, Arizona, United States of America, North America

Panorama view of the Painted Desert from Tawa Point in Petrified Forest National Park, Arizona, United States of America, North America

Snow-capped Sawtooth Mountains, near Redfish Lake, Rocky Mountains, Idaho, United States of America, North America

Panorama of Olmsted Point, off Tioga Pass Road in Yosemite National Park, UNESCO World Heritage Site, California, 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

Clouds over High Peaks of the Adirondack Mountains and Heart Lake near Lake Placid, New York State, United States of America, North America

Brothers ride their One-Wheels on a single track mountain biking trail next to the Potomac River, Bethesda, Maryland, United States of America, North America

The Washakie Wilderness area within Shoshone National Forest, Wyoming, United States of America, North America

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

A calming mountain stream flows through dense summer forest, Blue Ridge Mountains, Appalachian Mountains, North Carolina, United States of America, North America

A cliff overhang shaped like the head of a Duck west of Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Fresh snow fall on El Capitan in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Grand Canyon, near Duck on a rock viewpoint, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Autumn colored Aspen trees off Cape Royal Road in Grand Canyon North Rim, UNESCO, Arizona, United States of America

Burned forest area taken over by young Aspen trees in fall colors east of Greenland Lake, Grand Canyon North Rim, Arizona, United States of America

The 12th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Traditional dressed Evenki hunter with snow shoes before a traditional Evenki Yurt in Tura, Krasnoyarsk Krai, Evenki state, Russia

Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, Arizona, United States of America

Checkerboard Mesa, a sandstone peak standing 900 feet high, Kane County, Zion National Park, Utah, United States of America

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Woman doing the washing-up, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Spituk Monastery (Gompa) in Leh district, Indus River valley, Ladakh region, state of Jammu and Kashmir, India, Asia

An information sign on the summit of Apache Maid Mountai, Coconino National Forest, Arizona, United States of America

View from second deck of fire watchtower on summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America

Road to the summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America

Partial View of Mount Denali (Mount McKinley) in Denali National Park, Alaska, United States of America

Adult snowshoe hare (Lepus americanus dalli) in Denali National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Houseboats moored in Wahweap Bay, Castle Rock beyond, Lake Powell, Glen Canyon National Recreation Area, Page, Arizona, United States of America, North America

Mount St. Helens with wild flowers, Mount St. Helens National Volcanic Monument, Washington State, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

Rudyerd Bay ripples, beautiful summer day, Misty Fjords National Monument, Tongass National Forest, Alaska, United States of America, North America

Spectacular Tracy Arm Fjord, brilliant blue icebergs and backlit clearing mist, mountains and South Sawyer Glacier, Alaska, United States of America, North America

Bitterfoot Range, with the first snow of winter, South West Montana, United States of America, North America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

Panorama of Sedona viewed from the summit of Doe Mountain, Arizona, United States of America, North America

Adult female elk (Cervus canadensis) on String Lake, Grand Teton National Park, Wyoming, United States of America, North America

An adult American red squirrel (Tamiasciurus hudsonicus), Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

View from the Pa'rus Trail across woodland to the Towers of the Virgin, autumn, Zion National Park, Utah, United States of America, North America

Ancient Indian Ruins near Granite Mountain in the Prescott National Forest, Arizona, United States of America, North America

Snow-capped mountains and a frozen lake near Beartooth Pass, Wyoming, United States of America, North America

A small group of Dall sheep (Ovis dalli) grazing on a mountainside in Denali National Park, Alaska, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

A lone hoodoo rock on the edge of a ridge overlooking the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

View from below a ridge that overlooks the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Aerial view of the Leconte Glacier, flowing from the Stikine Ice Field near Petersburg, Southeast Alaska, United States of America, North America

Yellowstone waterfall during a snowstorm in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Footbridge at the peak of Grandfather Mountain, Blue Ridge Mountains, Appalachia, North Carolina, United States of America, North America

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

Osprey (Pandion haliaetus) along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

American Bison (Bison Bison) in the snow in the Badlands, Badlands National Park, South Dakota, United States of America, North America

Watchman mountain, Watchman trail, Zion National Park, Utah, United States of America, North America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

Traditional dressed Evenki hunter with snow shoes before a traditional Evenki Yurt in Tura, Krasnoyarsk Krai, Evenki state, Russia