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One of many fossil filled boulders in the Clam Beds along Red Basin Trail in Petrified Forest National Park, Arizona, United States of America, North America

An old windmill marking the boundary of the Devil's Playground in Petrified Forest National Park, Arizona, United States of America, North America

Footsteps trail path between the sand dunes of Sahara Desert, Merzouga, Morocco, North Africa, Africa

Two dry trees in Sossusvlei desert, high contrast between the red sand in the background and the white sand on the floor, Namib Desert, Namibia, Africa

Shadows of people riding camels in a caravan at Zagora Desert, Draa-Tafilalet Region, Morocco, North Africa, Africa

Shadows of people riding camels in a caravan in Zagora Desert, Draa-Tafilalet Region, Morocco, North Africa, Africa

Salt caravan transporting salt through the desert, Oasis Fachi, Tenere desert, Niger, West Africa, Africa

Salt caravan transporting salt through the desert, Oasis Fachi, Tenere desert, Niger, West Africa, Africa

Snow covered dry stone wall, near Almscliff Crag, Wharfe Valley, North Yorkshire, England, United Kingdom, Europe

Villagers stopping to eat near the fragile edge of a sandspit in the River Ganges, Sonepur, Bihar, India, Asia

People walking home across Nam Cuong sand dunes, Ninh Thuan, Vietnam, Indochina, Southeast Asia, Asia

People walking home across Nam Cuong sand dunes, Ninh Thuan, Vietnam, Indochina, Southeast Asia, Asia

People walking home across Nam Cuong sand dunes, Ninh Thuan, Vietnam, Indochina, Southeast Asia, Asia

Panorama of Tsu'Vo Buttes in Homolovi State Park, Tsu'Vo is a Hopi word meaning Path of Rattlesnakes, Arizona, United States of America, North America

Car trail lights on desert road crossing the barren land at dusk, Vallebron lookout, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Gouthwaite Reservoir, Dales Barns and Dry Stone Walls in Nidderdale, The Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

Aerial of the Rock Art in the Ha'il Region, UNESCO World Heritage Site, Jubbah, Kingdom of Saudi Arabia, Middle East

Tomb of Lihyan son of Kuza, Madain Saleh (Hegra) (Al Hijr), UNESCO World Heritage Site, Al Ula, Kingdom of Saudi Arabia, Middle East

Aerial of the rock tombs, Madain Saleh (Hegra) (Al Hijr), UNESCO World Heritage Site, Al Ula, Kingdom of Saudi Arabia, Middle East

Rock tomb, Madain Saleh (Hegra) (Al Hijr), UNESCO World Heritage Site, Al Ula, Kingdom of Saudi Arabia, Middle East

Lonely Dell Ranch Corral at Vermilion Cliffs National Monument near the Glen Canyon Recreation Area, Arizona, United States of America, North America

Antique truck at Lonely Dell Ranch, Vermilion Cliffs National Monument, Arizona, United States of America, North America

People watching the sunset and taking selfie photos at Maspalomas sand dunes, near Playa de los Ingleses, Gran Canaria, Canary Islands, Spain, Atlantic, Europe

A majestic road crossing the beautiful Valley of Fire, Nevada, United States of America, North America

A majestic road crossing the beautiful Valley of Fire, Nevada, 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

Steps along the Giant Logs Trail leading to a scenic overlook in Petrified Forest National Park, Arizona, United States of America, North America

Hills of purple and gray bentonite near Hamilili Point on the south end of 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

Rock islands above the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A solitary rock hoodoo in the purple badlands near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A circular walkway for the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

Mudbrick buildings of an ancient village with red canyons in backgrounds, Ziz Valley, Atlas mountains, Morocco, North Africa, Africa

View of the fortified old village and surrounding mountains, Telouet Kasbah High Atlas, Morocco, North Africa, Africa

Historic village in a desert oasis framed by majestic gorges, Ziz Valley, Atlas mountains, Morocco, North Africa, Africa

The columns of a ruined structure at the Pre-Aksumite settlement of Qohaito (Koloe), Eritrea, Africa

Watering place on the Argitchi plateau, Armaghan volcano in the background, Gegharkunik region, Armenia, Eurasia

On the Trail with Pack Mules transporting gear to Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

A section of Petrified Forest National Park called Angel Garden, northwest of the Onyx Bridge, Arizona, United States of America, North America

A female greater kudu (Tragelaphus strepsiceros) and springbok (Antidorcas marsupialis) drinking at a waterhole, Nxai Pan National Park, Botswana, Africa

Dry stone wall and towering cliffs of basalt lava over Jurassic sediments at the Quiraing, a famous hike and scenic attraction in the far north east of the island, Quiraing, Staffin, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America

Alerted springboks (Antidorcas marsupialis) watching lion cubs (Panthera leo), Nxai Pan National Park, Botswana, Africa

A hoodoo spire shaped like a Horse Head, in the valley below Blue Mesa of 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

An unnamed canyon that leads into 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

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Woman photographing Palm plantation colonized by invasive Sodom apple (Calotropis procera), Sharaan Nature Reserve, Medina Province, Saudi Arabia