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

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

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

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

Aerial view from helicopter, of a farm in an ancient oasis in the desert with canyons of the Ashar Valley,AlUla, Medina Province, Saudi Arabia

Aerial view of the Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

Aerial view of Qasr al-Farid, the largest tomb within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

Entrance of the passage through the Siq channel at Jabal Ithlib area of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Passage through the Siq channel at Jabal Ithlib area within the Site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Passage through the Siq channel at Jabal Ithlib area within the Site of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Woman at Tomb of Lihyan, son of Kuza (Qasr al-Farid), carved into sandstone outcrop in Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Early Morning Sunrise, West Mitten Butte, Monument Valley Navajo Tribal Park, Utah, United States of America

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

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

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

Basalt boulders and cliffs, Johnson Canyon between Bainbridge Steel and Stone Dams, Kaibab National Forest, Arizona, United States of America

Sandy beach on Pettit Lake in a valley north of Sun Valley, Sawtooth National Forest, Idaho, United States of America, North America

A dry waterfall in Crystal Creek below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Perito Moreno Glacier, UNESCO World Heritage Site, around El Calafate, Santa Cruz province, Patagonia, Argentina, South America

A view of the upper and lower Mitchell Bay waterfalls, Kimberley, Western Australia, Australia, Pacific

View across clear turquoise water to rocky headland at northern end of the Spiaggia Rosa, Budelli Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

Dramatic mountain landscape and geological fault in the Italian Alps, Colle del Turlo, Vercelli, Piedmont, Italy, Europe

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

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

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

Makhtesh Ramon is a geological landform,commonly known as 'crater' but more accurately described as erosion cirque,Negev,Israel,Middle East,Western Asia

Makhtesh Ramon is a geological landform,commonly known as 'crater' but more accurately described as erosion cirque,Negev,Israel,Middle East,Western Asia

Alpine wildflower meadows along the Ptarmigan Cirque Trail in summer, Kananaskis Country, Alberta, Canadian Rockies, Canada, North America

Aerial view of Cavusin and hot air balloons at dawn, Avanos District, Nevsehir Province, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia

Iceberg in Lemaire Channel on the western side of the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

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

Scenic view of hoodoos and rock formations, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Dramatic canyon terrain at Grand View Point at dusk, Canyonlands National Park, Utah, United States of America, North America

Abstract named Lady in Red, orange slot canyon wall, Antelope Canyon X, Page, Arizona, United States of America, North America

Grand Canyon, Duck on a rock viewpoint, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, 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

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of Roaring Springs Canyon 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

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

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

View of Black Canyon on the west side of the Agua Fria National Monument of Arizona with the Bradshaw Mountains in the distance.

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

The ruined engine house of Carn Galver tin mine against the afternoon light, near Pendeen, Cornwall, Great Britain.

The cliffshide ruins of the engine house of Botallack tin mine, on the Atlantic coast near St Just, Cornwall, Great Britain.