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Dramatic purple sunset above snowy rugged summits of Los Cumbres Verdes, part of the Sierra Nevada, viewed from Granada, Andalucia, Spain

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

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

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

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

Old water tank perched on a cliff overlooking the T-Bar Ranch Homestead in the Coconino National Forest of Arizona, United States of America

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

Cyclist on promontory facing the Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

View of the mountains of Vestrahorn from black volcanic sand beach, Stokksnes, South Iceland, Iceland, Polar Regions

Volcanic landscape with small plants in the Timanfaya national park in Lanzarote in the Canary Islands, Spain

Panorama of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Aerial view of a winding mountain road curves, Kalmak Ashuu Pass, through lush greenery in Kyrgyzstan, Central Asia, Asia

Southwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

One of the twin 100 meter waterfalls formed in the Warton Sandstone, King George River, Kimberley, Western Australia, Australia, Pacific

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The Trotternish Ridge north of the Quiraing, a major geological feature of lava flows over Jurassic sediments, a major scenic attraction in the far north east of the island, Flodigarry, Trotternish Peninsula, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Crumbling cliffs in the landslide landscape of the Quiraing, the famous hike and scenic attraction in the far north east of the island, Quiraing, Staffin, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

The Lindblad Expedition ship National Geographic Explorer running Zodiac operations in Bjornoya (Bear Island) in the Svalbard Archipelago, Norway, Arctic, Europe

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

Views of the famous stone runs just outside Stanley, the capital and only true city , with a cathedral, in the Falkland Islands, South America

Mountains in the Andes near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Herd of wild horses in the Sierra Nevada mountains near Pico del Veleta, Granada Province, Andalusia, Spain, Europe

Checkerboard Mesa, a sandstone peak standing 900 feet high, in Kane County, Zion National Park, Utah, United States of America, North America

Bryce Canyon amphitheater, Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

Boat on the shore of Holy Island with Lindisfarne Castle in the background, Northumberland, England, United Kingdom, Europe

Details of the rock formation at Zabriskie Point, Death Valley, California, United States of America, North America

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

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

January 27, 2011 - Dallol geothermal area, potassium salt deposits formed by brine hot springs, Danakil Depression, Ethiopia.

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

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

A tourist at Arco de Tajao during sunrise, El Poris de Abona, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

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

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

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Horse free-roaming near the Alqaleebah Gate of Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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