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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

Purple badlands of bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Rock islands above 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

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 circular walkway for the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

Panoramic view, crater of Blue Lake and Tongariro Volcano at sunrise, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

Hen Cloud in autumn, part of The Roaches rock escarpment, near Leek, Peak District National Park, Staffordshire Moorlands, Staffordshire, England, United Kingdom, Europe

Hen Cloud from The Roaches rock formation in autumn, near Leek, Peak District National Park, Staffordshire Moorlands, Staffordshire, England, United Kingdom, Europe

Hoar frosted trees and freezing fog at The Roaches rock formation in Winter, The Roaches, near Leek, Peak District National Park, Staffordshire Moorlands, Staffordshire, England, United Kingdom, Europe

The Roaches rock formation in autumn, near Leek, Peak District National Park, Staffordshire Moorlands, Staffordshire, England, United Kingdom, Europe

Mist and Fog in the Upper Dove Valley at dawn, near Longnor, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Mother Cap Tor in autumn, Hathersage Moor, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Carl Walk Hillfort from Over Owler Tor at dusk, Hathersage Moor, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Combs Edge and Combs Moss in autumn, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Aerial view of Campo Imperatore plateau during spring thaw at dawn, Gran Sasso and Monti della Laga National Park, L'Aquila province, Abruzzo, Italy, Europe

Northern Patagonian Ice Field, aerial view, Laguna San Rafael National Park, Aysen Region, Patagonia, Chile, South America

Glacial lake with small icebergs floating, Laguna San Rafael National Park, Aysen Region, Patagonia, Chile, South America

An adult great blue heron (Ardea herodias), spears a fish in Shark Valley, Everglades National Park, Florida, United States of America, North America

Lava flow, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, North America

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Shiraito Falls, Fuji-Hakone-Izu National Park, UNESCO World Heritage Site, Shizuoka Prefecture, Honshu, Japan, Asia

Adult marabou stork (Leptoptilos crumenifer), roosting in a tree in Tarangire National Park, Tanzania, East Africa, Africa

The small illuminated village of Pietracamela covered with snow and surrounded by Intermesoli snowy peak at dusk, Gran Sasso and Monti della Laga National Park, Apennines, Teramo district, Abruzzo region, Italy, Europe

African wild dogs (Lycaon pictus), feeding on a wildebeest calf kill in Serengeti National Park, Tanzania, East Africa, Africa

View of the Grand Canyon east of the historic Watch Tower, managed by the National Park Service, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Aerial winter view of the snow covered medieval village of Rocca Calascio with the castle surrounded by clouds at dusk, Rocca Calascio, Gran Sasso e Monti della Laga National Park, Campo Imperatore, L'Aquila province, Abruzzo region, Italy, Europe

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Lone American bison with steaming thermal features in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Man with lantern among snow covered trees enjoying the green lights of the Northern Lights (Aurora Borealis), in the wood, Pallas-Yllastunturi National Park, Muonio, Lapland, Finland, 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

Tightly coiled fern frond (fiddlehead) in the rainforest on Tenorio volcano, Volcan Tenorio National Park, Alajuela, Costa Rica, Central 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

An adult lioness (Panthera leo) with playful cub along the Luangwa River in South Luangwa National Park, Zambia, Africa

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

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

Abraham Lake in Spring, Banff National Park and Kootenay Plains, Alberta, Canadian Rockies, Canada, North America

Wild male plains bison during the mating season, Elk Island National Park, Alberta, Canada, 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

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

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

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

Rapids on the Colorado River, Marble Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View of the Colorado River from the Glen Canyon Dam Bridge on Highway 89, Arizona, 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

Towering white rock monolith Pizzomunno at sunrise, Vieste, Foggia province, Gargano National Park, Apulia, Italy, Europe

Woman hiking along The Petrified Forest Loop Trail inside Theodore Roosevelt National Park, North Dakota, United States of America, North America

View of Seven Sisters Chalk Cliffs and Coastguard Cottages at Cuckmere Haven, South Downs National Park, East Sussex, England, United Kingdom, Europe

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

Migratory blue wildebeest (Connochaetes taurinus) crossing the Mara River, Masai Mara National Reserve, Kenya, East Africa, Africa

Emerald Spring in the Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sheep grazing and distant dry stone walls around Arncliffe Village in Littondale, The Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Lower Aysgarth Falls on the River Ure, near Leyburn, Wensleydale, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

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

Stone outcrops forming rock formations, Vale da Lua, Chapada dos Veadeiros National Park, UNESCO World Heritage Site, Goias, Brazil, South America

Short-beaked echidna (Tachyglossus aculeatus), crossing the road, Cape Range National Park, Western Australia, Australia, Pacific

Lion (Panthera leo), Buffalo Springs National Reserve, Samburu National Park, Kenya, East Africa, Africa

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

Rainbow and showers over the Cumbrian Fells around Elter Water (Elterwater) in the south east Lake District, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Ullswater from Park Brow near Aira Force, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Froggatt Edge at the turn of autumn, near Calver, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Closeup of the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A deep canyon eroded thru the hills of purple and gray bentonite clay near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Purple badlands of 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 sign along the main road pointing the way to the Long Logs Trail, and Agate House, Petrified Forest National Park, Arizona, United States of America, North America

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

Sheepwash Bridge and the River Wye in autumn, Ashford in the Water, Peak District National Park, Derbyshire, England, United Kingdom, Europe

St. Lawrence Parish Church in autumn, Eyam, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Poplar trees in front of the Andes, Patagonia National Park, Chacabuco valley near Cochrane, Aysen Region, Patagonia, Chile, South America

Volcanic landscape, Mauna Loa, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, North America

White-Throated Kingfisher (Halcyon smyrnensis smyrnensis), Ranthambhore National Park, Rajasthan, India, Asia

African wild dogs (Lycaon pictus), feeding on a wildebeest calf kill in Serengeti National Park, Tanzania, East Africa, Africa

An area of the Little Colorado River Gorge east of the Grand Canyon, Arizona, Uninted States of America, North America

Aerial view of the orange Svortuloft lighthouse on top of the basalt cliffs at sunset, Snaefellsbaer, Snaefellsjokull National Park, Snaefellsens peninsula, Vesturland, West Iceland, Iceland, Polar Regions

The boundary fence on the east side of Petrified Forest National Park, Arizona, United States of America

Aerial view over the Valley of the Rocks and Lynton, Exmoor National Park, North Devon, England, United Kingdom, Europe

Evening eruption of Old Faithful geyser with tree and snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The 11th century Church of St. Mary The Virgin on a foggy winter morning, Friston, South Downs National Park, East Sussex, England, United Kingdom, Europe

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

Visitor dwarfed by landscape of colourful rocks, Artist's Palette, Furnace Creek, Death Valley National Park, California, United States of America, North America