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Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

The east cliffs of Blue Mesa near sunset, Petrified Forest National Park, Arizona, United States of America, North America

Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

The Red Wall of sandstone east of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Trailhead for a sinkhole called the Keyhole Sink in Williams Arizona within the Kaibab National Forest, Arizona, USA

Sign marking Badger Springs Road off of I-17 Arizona. This road leads to a hiking trail in the Agua Fria National Monument.

The B3212, one of the main roads across Dartmoor, in winter snow, near Moretonhampstead, Dartmoor National Park, Devon, Great Britain.

A snowbound brook in the dead of winter, near Moretonhampstead, Dartmoor National Park, Devon, Great Britain.

Bennett's Cross, an ancient granite monument, in winter snow, near Warren House, Dartmoor National Park, Devon, Great Britain.

Cuckmere Haven in the South Downs National Park, East Sussex, England, UK, where the Cuckmere river flows into the English Channel. The chalk cliffs to the East are known as the Seven Sisters.

Sandstone rock formation in the Dixie National Forest, Utah, USA. The National Forest was created in 1906.

A tourist observes Teide volcano from La Ruleta viewpoint during sunrise, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

Vew from Aconcagua 6962m, highest peak in South America, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Climber ice climbing on glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Glacier near Plaza de Mulas basecamp, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Climber nearing the summit of Aconcagua 6962m, highest peak in South America, Aconcagua Provincial Park, Andes mountains, Argentina, South America

Hikers taking selfies at foot of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

Hikers on path between Locatelli and Pian di Cengia refuges with Punta dei Tre Scarperi behind, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

The Seven Sisters chalk cliffs from Birling Gap, South Downs National Park, East Sussex, England, United Kingdom

Woman walking with headlamp at the bottom of canyon with sandstone walls in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

View of Johnson Canyon from the Johnson Canyon Railroad Grade, Kaibab National Forest of Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Arrangement of shale stones in a circle, on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Chortens (stupa) in front of a isolated guesthouse, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Shepherd and flock of sheep and goat on the path to Stokla pass (4900) from Rumbak, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Ice flower sculpted by wind at Stokla pass (4900m), Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekkers resting and having picnic at Stokla pass (4900), Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

View on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Shepherd and flock of sheep leaving Rumbak village, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Caravan of pack horses, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Isolated guesthouse, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Isolated guesthouse, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Brick enclosures of dried earth for cattle, goats, Rumbak village, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Shepherd with a flock of sheep and Pashmina goats on the path to Stokla pass (4900) from Rumbak, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Villagers on a mule track on the way to Rumbak village, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Hikers crossing a torrent on a footbridge in Zingchen gorge, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Caravan on a mule track in Yurutse valle near Rumbak village, Hemis National Park, Zingchen gorge, , Ladakh region, state of Jammu and Kashmir, India, Asia

Yurutse valley near Rumbak village, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Chortens (stupa) at the ebtrance of the Rumbak valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Twin Erratic boulders high above Nant Ffrancon valley, Snowdonia National Park (Eryri), North Wales, United Kingdom

Cotton Grass on Bera Mawr looking to Bera Bach, Carneddau Mountains, Snowdonia National Park (Eryri), North Wales, United Kingdom

Mine working and spoil tip remains, Dinorwig Quarry (Dinorwic Quarry), Llyn Peris behind, Eryri (Snowdonia National Park), North Wales, United Kingdom

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

Partial View of Mount Denali (Mount McKinley) in Denali National Park, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Riding the bus along the 92 mile-long road into Denali National Park, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, 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

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

A beautiful waterfall just outside the small Norwegian summer area in Sandvika Bay on the south side of Svesfjord, Norway

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

Djebel Saghro, near Tizi'n-Tinififft, on the road from Ouarzazate to Agdz, Draa-Tafilet region, Morocco

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