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The crumbling cliffs of a mesa near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A petrified tree log that has shattered over time, located on a mesa 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

The paved path, that used to be an old road, leading to the Long Logs Trail and Agate House in Petrified Forest National Park, Arizona, United States of America, North America

View of a bentonite hill along the Long Logs Trail in 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

Vast arid volcanic landscape before sunrise, on high plateau of Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Steam of the volcano on ashes and arid landscapes, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Crumbling islands of rock near Hamilili Point in Petrified Forest, Arizona, United States of America, North America

Islands of Rock in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A lone hoodoo rock on the edge of a ridge overlooking the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A cliff overhang shaped like the head of a Duck west of Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Crumbling cliffs of a mesa near Hamilili Point in Petrified Forest, Arizona, United States of America, North America

A ridge of gray bentonite viewed from a nearby flat top mesa on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Donkeys and riders, Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

The Petra Treasury (Al-Khazneh), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

The Petra Treasury (Al-Khazneh), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

Blooming flowers in front of the columns of a ruined structure at the Pre-Aksumite settlement of Qohaito (Koloe), Eritrea, Africa

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

Blue hour on the Sahara Desert sand dune patterns, Erg Chebbi, Merzouga, Morocco, North Africa, Africa

The Devil's Golf Course, a large salt pan filled with halite salt crystal, Death Valley National Park, California, United States of America, North America

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

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

View over the canyon and arid landscape of Los Cahorros Monachil, Monachil, Sierra Nevada, Granada, Andalusia, Spain, Europe

Cactus and El Misti and Chachani volcanoes, Salinas y Aguada Blanca National Reserve, Arequipa Region, Peru, South America

Sand dunes in desert at sunset, Huacachina, Ica District, Ica Province, Ica Region, Peru, South America

Sand dunes in desert at sunset, Huacachina, Ica District, Ica Province, Ica Region, Peru, South America

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

Aerial view of empty desert road, Mirador del Risco de las Penas viewpoint, Pajara, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

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

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

Camels in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Beautiful tree (sedar), on edge of Wadi Bani Awf, NE slope of Jebel Akhdar, Western Hajar Mountains, Al-Dakhiliyah region, Oman, Arabian Peninsula

Road through the sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Safari tour among the magnificent sandstone rock structures in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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

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

Encounter with dromedaries on the road that crosses the Harrat volcanic plateau, AlUla, Medina Province, Saudi Arabia

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

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

Aerial view of the Jabal Alfil (Elephant Rock), a natural red sandstone formation, in the area of AlUla, Medina Province, Saudi Arabia