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

Viewpoint on top of the Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

Pronghorn (Antilocapra americana) buck in the snow, Grand Teton National Park, 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

Ubehebe Crater, a volcanic crater half a mile across and 600 feet deep, Death Valley National Park, California, 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

Sunrise from Zabriskie Point, Death Valley National Park, California, United States of America, North America

Sea grasses on a Lake Michigan beach, Sleeping Bear Dunes National Park, Glen Arbor, Michigan, United States of America, North America

Lake Crescent, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Beach, Sleeping Bear Dunes National Park, Glen Arbor, Michigan, United States of America, North America

Junction sign for the trails leading to Angels Window and Cape Royal at Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bright Angel Point trail sign pointing the way to the overlook on Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Uinta Ground Squirrel (Urocitellus armatus), Yellowstone National Park, Wyoming, 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

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

Tourists and holidaymakers on Sand Beach on Mount Desert Island, Acadia National Park, Maine, New England, 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

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

Tower of Babel, Courthouse Towers, Arches National Park, Utah, 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 Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

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

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

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

Mesquite flat sand dunes in Death Valley National Park, California, United States of America, North America

The first tunnel along Bright Angel Trail in winter under Moonlight on the South Rim of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The cliffs of Bright Angel Canyon along the Bright Angel Trail in winter near midday on the South Rim of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Views from the Skyline Trail of 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, USA.

Joshua Tree (Yucca brevifolia), Joshua Tree National Park, Mojave Desert, California, 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

Watchman Mountain, Zion National Park, Colorado Plateau, Utah, United States of America, North America

An area south of the Tepees in Petrified Forest National Park known as the Little Tepees, Arizona, 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

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Photographing at the Puebloan granaries at Upper Nankoweap, Grand Canyon National Park, Arizona, United States of America, North America

Flight seeing from Haines over the Fair-weather Range in Glacier Bay National Park, Southeast Alaska, USA.

A view of Margerie Glacier in the Fair-weather Range, Glacier Bay National Park, Southeast Alaska, USA.

An adult Scotts oriole (Icterus parisorum), Big Bend National Park, Texas, United States of America, North America

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

A stream running through the Mossy Cave Trail in Bryce Canyon National Park, Utah, United States of America, North America

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Landscape with Green River in the Island in the Sky District of the Canyonlands National Park, in Utah, USA *** Local Caption ***

Grand Canyon viewed west of Navajo Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Top-heavy hoodoo, pine trees and cliffs with snow and a cloudy sky, Agua Canyon, Bryce Canyon National Park, Utah, United States of America, North America

Mesa Arch at sunrise, Canyonlands National Park, Island In The Sky District, Utah, United States of America, North America

Grand Canyon view from Moran Point on a cloudy day with the clouds floating inside the canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Light dusting of snow on the pines around the Virginia Cascades, Norris to Canyon Road, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sol Duc Falls, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

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

Upper and Lower Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

View over valley with colourful foliage in the Indian summer, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

Brown Bear (Ursus arctos horribilis) sow and cub, Katmai National Park and Preserve, Alaska, United States of America, North America

Sunset and Turret Arch view through Windows Arch, Arches National Park, Utah, United States of America, North America

A view of Natural Bridge Canyon in Death Valley National Park, California, United States of America, North America

Desert collared lizard (Crotaphytus bicinctores), Mosaic Canyon Trail, Death Valley National Park, California, United States of America, North America

The Salt Flats of Badwater Basin, the lowest point in North America, Death Valley National Park, California, United States of America, North America

View of stars through Double Arch, Arches National Park, Utah, United States of America, North America

Starry sky viewed through Broken Arch, Arches National Park, Utah, United States of America, North America

Trumpeter swan in river, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

First light on Teton Range at Moulton Barn in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Landscape view through Navajo Arch, Arches National Park, Utah, United States of America, North America

Sunset and Turret Arch view through Windows Arch, Arches National Park, Utah, United States of America, North America