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Man standing on rocks looking at clouds at sunset over lake Limmernsee, aerial view, Canton of Glarus, Switzerland, Europe

The boundary fence between Coconino National Forest and Sunset Crater National Monument of Arizona, USA

Aerial drone panoramic view of Fort of Nossa Senhora da Rocha (Fort of Our Lady of the Rock) (Castle of Porches), Porches, Lagoa, Algarve, Portugal

Aerial drone panoramic view of Fort of Nossa Senhora da Rocha (Fort of Our Lady of the Rock) (Castle of Porches), Porches, Lagoa, Algarve, Portugal

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

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

East Zion National Park where Highway 9 winds between the Zion-Mount Carmel Tunnel and Checkerboard Mesa, Utah, United States of America

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

November 13, 2007 - Moeraki Boulders, round septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

November 13, 2007 - Moeraki Boulders, spherical septarian concretions created by cementation of Paleocene mudstone of the Moeraki formation, Koekohe Beach, New Zealand.

Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

A rock table sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

View of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall west of Hamilili Point in 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

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

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Crystal Mesa above Crystal Creek west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A sloping red sand dune above Hamilili Wash in Petrified Forest National Park, Arizona, United States of America, North America

Highway US89A looking east to Vermilion Cliffs National Monument with Kaibab National Forest boundary sign, Arizona, United States of America

Red Wall cliffs of Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, Arizona, United States of America

The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 17th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 20th switchback along the North Kaibab Trail at 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

Textured Pancake Rocks Overlooking the Tasman Sea with Native Shrubs, Paparoa National Park, New Zealand

Blowhole and Carved Limestone Cliffs at Pancake Rocks, Punakaiki, Paparoa National Park, New Zealand

A climber tackles a difficult overhang on the cliffs near Sennen Cove, a popular rock climbing area at Lands End, Cornwall, England, United Kingdom, Europe

Two mountain goat (Oreamnos americanus) kids, Mount Evans, Colorado, United States of America, North America

View of boats in Marina Grande and shops and cafes on the quayside, Isle of Capri, Bay of Naples, Campania, Italy, Mediterranean, Europe

Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico

View of rocky coastline and Atlantic sea at sunset near El Pagador, Las Palmas, Gran Canaria, Canary Islands, Spain, Atlantic, Europe

A waterfall cascades down a gorge cut into coastal cliffs, at Speke's Mill Mouth, near Hartland Quay, on Devon's Atlantic coast, Devon, England, United Kingdom, Europe

Round rocks in the Virgin River near The Narrows, Zion National Park, Utah, United States of America, North America

The rocky River Plym running through an autumnal Cadworthy Wood, Dartmoor National Park, Devon, England, United Kingdom, Europe

View towards Chatsworth from Curbar Edge, with Calver and Curbar villages, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Curved Sand Dunes and Sea Stacks at Sunrise on Remote Wharariki Beach, Golden Bay, South Island, New Zealand

Galapagos Land Iguana (Conolophus subcristatus), large lizard can can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Autumnal waterfall along the Four Waterfalls walk, Waterfall Country, Brecon Beacons National Park, South Wales, United Kingdom, Europe

Textured Coastal Rocks and Forest Edge at Low Tide, Abel Tasman National Park, South Island, New Zealand

Powerful Sea Surge Through Blowhole in Honey-Colored Rock at Pancake Rocks, Punakaiki, West Coast, New Zealand

Dramatic Rock Spires and Crashing Waves at Pancake Rocks, Punakaiki, Paparoa National Park, West Coast, New Zealand

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

Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Young woman by the torrent, Riva Valley (Val di Riva) (Reintal), near Ahrntal (Valle Aurina), South Tyrol (Alto Adige), Italy

Hiker at the foot of the Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

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

Val Marzon viewed from path connecting refuges Auronzo and Lavaredo, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

North face of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

Hikers on path overlooking the Lago dei Piani inferiore, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

Vertical View of Pancake Rocks and Surf Below with Flax and Cliffside Vegetation in Punakaiki, New Zealand

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

Close to entrance to Jenny's Canyon, Snow Canyon State Park, near St. George, Utah, United States of America

Pieces of petrified wood on hills overlooking 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

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