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Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

Pit House, Step House Ruin, dates from 626AD to 1226AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) dripping wet while fishing, Katmai National Park and Preserve, Alaska, United States of America, North America

Pine tree growing on a sandstone ledge, Zion National Park, Utah, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

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

El Capitan, a 3000 feet granite monolith, with the Merced River flowing through Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

Lake Millinocket at sunrise, Baxter State Park, Maine, New England, United States of America, North America

Badlands with maroon color, Capitol Reef National Park, Utah, United States of America, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Checkerboard Mesa, formed of Navajo sandstone, Zion National Park, Utah, United States of America, North America

Colorado River from Dead Horse Point Overlook, Dead Horse Point State Park, Utah, United States of America, North America

Beautiful rock formations in the Needles, Canyonlands National Park, Utah, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Ephedra spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mesa Arch sunrise, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

Canoes for hire on Lake Louise, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Bison (Bison bison) reflected in a pond, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View across Vermilion Lakes to Mount Rundle, at sunset, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Sandstone formations in the Cathedral Gorge State Park, Nevada, United States of America, North America

Canoeing across Bowman Lake, Glacier National Park, Montana, United States of America, North America

Upland larkspur (Delphinium nuttallianum), Yellowstone National Park, Wyoming, United States of America, North America

Shrubby cinquefoil (Potentilla fruticosa), Waterton Lakes National Park, Alberta, Canada, North America

Bison (Bison bison) cow nursing her calf, Yellowstone National Park, Wyoming, United States of America, North America

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

Wavy orange and white sandstone at sunrise, Valley Of Fire State Park, Nevada, United States of America, North America

Greater roadrunner (Geococcyx californianus) in captivity, Living Desert Zoo And Gardens State Park, New Mexico, United States of America, North America

Orange and white sandstone layers with colorful clouds at sunrise, Valley Of Fire State Park, Nevada, United States of America, North America

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

Pyramid Mountain reflected in Pyramid Lake at dawn on a misty morning, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Athabasca Falls in the Canadian Rockies, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

The Icefields Parkway running through dramatic Canadian Rockies scenery, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Mammoth Hot Springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Dinorwic (Dinorwig) Power Station and Dinorwic Quarry across Llyn Peris, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

Walker looking out over the peak of Yr Aran and a fog filled Nant Gwynant Valley, Nant Gwynant, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

Yosemite Falls, reflected in a meadow flood pool, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yaadaas Crest Corner Pole, Tlingit totem pole, rainforest, Sitka National Historic Park, Sitka, Baranof Island, Alaska, United States of America, North America

Cliffs of Zion framed by autumn trees, Springdale, near Zion National Park, Utah, USA, North America

Early morning light, Staithes, North Yorkshire National Park, Yorkshire, England, United Kingdom, Europe

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

Lewis River meanders in the early morning;, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Palm trees in silhouette in park on bluff overlooking the Pacific Ocean, Santa Barbara, California, United States of America (U.S.A.), North America

Native American petroglyphs, Valley of Fire State Park, Nevada, United States of America, North America

Mesquite Sand Dunes at dawn, Death Valley National Park, California, United States of America, North America

Pink sunset sky above Tuolumne Meadows, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Red rocks towering above the shallow waters of Oak Creek, Slide Rock State Park, Sedona, Arizona, United States of America (U.S.A.), North America

Vermilion Lakes at dawn in the Canadian Rocky Mountains, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Black Canyon of the Gunnison National Park, Gunnison River deep in the canyon, Colorado, United States of America, North America

Num-Ti-Jah Lodge, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Vermilion Lakes, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Lake Louise, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Weeping Wall, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Spotted Sandpiper (Actitis macularia), Yellowstone National Park, Wyoming, United States of America, North America

Pueblo Bonito Chaco Culture National Historical Park scenery, New Mexico, United States of America, North America

Saguaro cactus, Saguaro National Park, Rincon Mountain District, Tucson, Arizona, United States of America, North America

Maritime Museum on the Willamette River in Waterfront Park, Portland, Oregon, United States of America, North America

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

Autumnal morning at Herbert Lake in the Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Northern (Steller) sea lions (Eumetopias jubatus), South Marble Island, Glacier Bay National Park, Southeastern Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Close-up of mouth of magnificent anemone (Heteractis magnifica), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Monument Valley Navajo Tribal Park, Park Road (foreground), West and East , Utah, United States of America, North America

White-crowned sparrow (Zonotrichia leucophrys), Caballo Lake State Park, New Mexico, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America