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Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, 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

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

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

Bison (Bison bison) cows in the snow with frost-covered trees in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Badger (Taxidea taxus) digging, Custer State Park, South Dakota, United States of America, North America

Late afternoon light on the Crater Lake of the Crater Lake National Park, Oregon, United States of America, North America

Bull elk (Cervus canadensis) bugling in the fall, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Pyramid Mountain reflected in a lake with autumn colour, Jasper National Park, UNESCO World Heritage Site, Canadian Rockies, Alberta, Canada, North America

Stormy weather and visitors exploring at Moraine Lake, Banff National Park, UNESCO World Heritage Site, Canadian Rockies, Alberta, Canada, North America

The Assiniboine Park Pavilion seen across the Duck Pond skating rink at Assiniboine Park, Winnipeg, Manitoba, Canada, North America

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

Eisenhower Peak on Castle Mountain at sunrise, Banff National Park, UNESCO World Heritage Site, Alberta, The Rockies, Canada, North America

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

Northern fur seal (Callorhinus ursinus), Resurrection Bay, Kenai Fjords National Park, Alaska, United States of America, North America

A hiker takes a break above Llyn Du'r Arddu, Snowdonia National Park, North Wales, United Kingdom, Europe

An adult brown bear (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

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

Hoh Rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Cathedral Rock seen from Red Rock State Park, Sedona, Arizona, United States of America, North America

Sunrise at Vermillion Lakes with Mount Rundle in autumn, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Woman in Desert Loop Trail in Carlsbad Caverns National Park, New Mexico, United States of America, North America

Huge formations of Bentonite Clay called the Teepees in the Petrified Forest National Park, Arizona, 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

Adult hoary marmot (Marmota caligata), on the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Roosevelt Elk at Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

View along the Pa'rus Trail to Mount Spry and the East Temple, autumn, Zion National Park, Utah, United States of America, North America

Curious Steller sea lions (Eumetopias jubatus), South Marble Islands, Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Desert sunset panorama with Chisos Mountains in the background, Big Bend National Park, Texas, United States of America, North America

Grand Canyon viewed from the west side of Maricopa Point along the Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A dry waterfall made of purple bentonite in the Flat Tops of Petrified Forest National Park, Arizona, United States of America, North America

Panorama of Tsu'Vo Buttes in Homolovi State Park, Tsu'Vo is a Hopi word meaning Path of Rattlesnakes, Arizona, United States of America, North America

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

Traditional stone barn in yellow buttercup meadow in Swaledale, Gunnerside, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Early morning mist in the Esk Valley around Lealholm in the North Yorkshire Moors National Park, Yorkshire, England, United Kingdom, Europe

Woman taking in the scenery while crossing a bridge in Mount Rainier National Park, Washington State, United States of America, North America

Peaks of Mount Edith Cavell, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Sunrise at Mount Rundle and Vermillion Lakes with ice and snow, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Apartments bordering Park Avenue in New York City's Upper East Side, New York City, United States of America, North America

Canoe on Emerald Lake, Yoho National Park, UNESCO World Heritage Site, British Columbia, Canada, North America

Kayaker at sunrise at Lake Moraine, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Fisheye view of Hance Canyon from the South Rim of Grand Canyon with Grandview Point is on the left, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Leo Mol bear sculpture in the Leo Mol Sculpture Garden in Assiniboine Park, Winnipeg, Manitoba, Canada, North America

Leo Mol sculpture in the Leo Mol Sculpture Garden in Assiniboine Park, Winnipeg, Manitoba, Canada, North America

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

Rocky mountain bighorn sheep (Ovis canadensis) lamb on a wintry mountain, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Rocky mountain bighorn sheep (Ovis canadensis) lamb on a wintry mountain, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Steaming fumarole field at Bukit Kasih, a tourist volcanic park with a world peace themed tower and worship houses of five major religions, Bukit Kasih, Minahasa, North Sulawesi, Indonesia, Southeast Asia, Asia

A warning sign to stay on the trail to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

An information sign detailing the history of Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A divide in the trail loop for the Giant Logs trail at Petrified Forest National Park with the Rainbow Forest Museum on upper left, Arizona, United States of America, North America

Steps along the Giant Logs Trail leading to a scenic overlook in Petrified Forest National Park, Arizona, United States of America, North America

Hills of purple and gray bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

The map sign at the gateway for the Long Logs Trail and Agate House in Petrified Forest National Park, Arizona, United States of America, North America

Walls of Tongariro Volcano lit by red sunrise, volcanic plains of New Zealand, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Sunrise at the volcano slopes Red Crater, Tongariror Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald Lakes at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Emerald lake on volcano slope, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Close up of turquoise, vibrant Emerald Lake with steaming volcano on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Steam of the volcano on ashes and arid landscapes, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

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

A ridge of gray bentonite viewed from a nearby flat top mesa 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

Arctic squirrel (Citellus parry), Denali National Park, Alaska, United States of America, North America

Upper Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, USA, North America

The summit of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Pinnacles and rock formations caused by erosion, in the Bryce Canyon National Park in Utah, United States of America, North America

Giant sequoia trees, Mariposa Grove, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

A gap between a stack of balanced boulders on a cliff east of Grandview Point at Grand Canyon South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bull moose (Alces alces) amongst autumn (fall) vegetation; Grand Teton National Park, Wyoming, United States of America, North America

Steam and turquoise depths at Black Pool, dawn, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Storm approaching Shoshone Point on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Ancient Indian rock art, petroglyphs, Newspaper Rock, near The Needles section of Canyonlands National Park, Utah, United States of America, North America

Snowscape with stream and trees in the fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

A climber bouldering on the large granite boulders near Camp 4, the National Park Service campground underneath El Capitan, Yosemite Valley, California, United States of America, North America

Grizzly bear (Ursus horribilis) in the fall, Denali National Park and Preserve, Alaska, United States of America, North America

Mushroom shaped sandstone spire on an eroded ridge west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A close up view of Lamplugh Glacier in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

A view in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Adult surf scoters (Melanitta perspicillata) in flight in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

Fruits of Acacia, Botanical Garden on El Nabatat Island (Kitchener's Island), Aswan, Egypt, North Africa, Africa

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The Colorado River makes a huge S-bend under Deadhorse Point, a famous viewpoint across Canyonlands National Park, near Moab, Utah, United States of America, North America

Panoramic view across marina from South Pointe Park, dusk, Downtown Miami in background, South Beach, Miami Beach, Florida, United States of America, North America