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A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads into Dead Wash at Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America

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

An island of rock in an unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Patches of snow in the shade of a hill in Dead Wash at Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

An old Model-T placed as a marker for the Route 66 Road Alignment in Petrified Forest National Park, Arizona, United States of America

Cliff view of Dead Wash Valley in Petrified Forest National Park, at sundown, Arizona, United States of America

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

View of Wet Beaver Creek off of the Bell Trail in Coconino National Forest, Arizona, United States of America

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

Wet Beaver Creek Canyon viewed from the south end of White Mesa in Coconino National Forest, Arizona, United States of America

Summer woodland along the banks of the boulder-strewn River Dart, at Dartmeet, Dartmoor National Park, Devon, England, United Kingdom, Europe

Boa, Acrantophis madagascariensis, Strict Nature Reserve of Lokobe, National Park, Nosy Be island, Republic of Madagascar, Indian Ocean

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

A warning sign stating that the road can be closed seasonally, Coconino National Forest, Arizona, United States of America

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

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

Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park, near Bristol Bay, Alaska, United States of America

Lodore Falls waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Wild European bison (Bison bonasus) walking in a meadow in winter, Bialowieza National Park, Poland, Europe

Basalt boulders and cliffs, Johnson Canyon east of Bainbridge Steel Dam Lake near Ash Fork, Kaibab National Forest, Arizona, United States of America

Basalt boulders and cliffs, Johnson Canyon east of Bainbridge Steel Dam Lake near Ash Fork, Kaibab National Forest, Arizona, United States of America

Old water pipe, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America

Basalt boulders and cliffs in a section of Johnson Canyon halfway between the Bainbridge Steel Dam and Stone Dam near Ash Fork Arizona in the Kaibab National Forest.

Basalt boulders and cliffs in a section of Johnson Canyon halfway between the Bainbridge Steel Dam and Stone Dam near Ash Fork Arizona in the Kaibab National Forest.

Grassland that used to be the J D Dam Lake, dry due to a drought in Arizona, Kaibab National Forest, south of Williams, Arizona, United States of America, North America

Wrangell-St. Elias National Park landscape from the Willow Lake, UNESCO World Heritage Site, Alaska, 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

Mountain view at sunset, Mount Rainier National Park, Washington State, United States of America, North America

Mountain range at Morant's Curve in autumn foliage, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, 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

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

Hills of blood red bentonite clay below Kachina Point in Petrified Forest National Park, Arizona, United States of America, North America

A glacial mountain river runs through a spruce forest in winter, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Hoodoo formations in the Devil's Playground in Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall ledge on the south end of Agate Plateau overlooking Jasper Forest in Petrified Forest National Park Arizona.

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

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

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

Maligne Canyon, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

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

Evening mist in the valley of the East Lyn River, near Lynmouth, Exmoor National Park, Devon, England, United Kingdom, Europe

Reflections, Tarn Hows, near Coniston, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

A mountain gorilla, a member of the Agasha family in the mountains of Volcanos National Park, Rwanda, Africa

A Silverback mountain gorilla, a member of the Agasha family in the mountains of Volcanos National Park, Rwanda, Africa

Man with lantern in the winter night walking an empty icy road while admiring Northern Lights (Aurora Borealis), Akaslompolo, Pallas-Yllastunturi National Park, Kolari municipality, Finnish Lapland, Finland, Europe

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

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

Mount Fitzwilliam at Pyramid Lake in Autumn with snow and morning mist, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Mount Fitzwilliam at Pyramid Lake in Autumn with snow and morning mist, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Aerial winter view of a hiker walking the snowy hill with trees covered with snow and ice at dusk, Mustavaara, Pallas-Yllastunturi National Park, Muonio, Finnish Lapland, Finland, Scandinavia, Europe

Hiker with lantern beside a mountain hut exlores the snowy forest under Northern Lights (Aurora Borealis), Pallas-Yllastunturi National Park, Muonio, Finnish Lapland, Finland, Scandinavia, Europe

Man with lantern standing in front of a typical Finnish hut (kota) in the wood covered with snow under Northern Lights (Aurora Borealis), Pallas-Yllastunturi National Park, Muonio, Finnish Lapland, Finland, Scandinavia, Europe

Bran Castle, Bran, near Brasov, Transylvania. The castle was built by Saxons in 1377 who were given the privilege by Louis I of Hungary. It is a national monument and landmark in Transylvania and famous for its association with the Dracula story.

Bran Castle, Bran, near Brasov, Transylvania. The castle was built by Saxons in 1377 who were given the privilege by Louis I of Hungary. It is a national monument and landmark in Transylvania and famous for its association with the Dracula story.

The paved trail that leads to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

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

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

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

The sun shade shelter along the Long Logs Trail at Petrified Forest National Park, Arizona, United States of America, North America

View of a bentonite hill along the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

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

Loch Lomond and Trossachs National Park Signboard with Ben More and the Crianlarich Hills behind in winter, Loch Lomond and Trossachs National Park, Scottish Highlands, Scotland, United Kingdom, Europe

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

Small mesas with flat tops called Rock Islands 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

Canoe trip on a branch of the river connecting the lakes Almajas and Asekas around Ginuciai, Aukstaitija National Park, Lithuania, Europe