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

Dinosaur head rock, Twyfelfontein, UNESCO World Heritage Site, Damaraland, Kunene Region, Namibia, Africa

The remains of a Guard Shack above the Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

View of Johnson Canyon from above the abandoned Johnson Canyon Railroad Tunnel in the Kaibab National Forest of Arizona, USA

A metal retaining wall holding up the Johnson Canyon Railroad grade that has been damaged, Kaibab National Forest of Arizona, USA

A section of the Johnson Canyon Railroad grade that has eroded away, Kaibab National Forest of Arizona, USA

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

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

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

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

View of Buttes from Artists Point, Monument Valley Navajo Tribal Park, Utah, United States of America

The colourful Navajo sandstone walls of Lower Antelope Canyon, sculpted by water into abstract patterns, Page, Arizona, United States of America, North America

Detail of wind and water erosion in the sandstone cliffs of the King George River, Koolama Bay, Kimberley, Western Australia, Australia, Pacific

Owachomo Bridge, Natural Bridges National Monument, Utah, United States of America (U.S.A.), North America

The hoodoos, rock formations formed by the erosion of Bentonite in the Badlands close to Drumheller in Alberta, Canada, North America

The hoodoos, rock formations formed by the erosion of Bentonite, in the Badlands close to Drumheller in Alberta, Canada, North America

The hoodoos, rock formations formed by the erosion of Bentonite, in the Badlands close to Drumheller in Alberta, Canada, North America

Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific

Rock formations at Sandwood Bay, with Am Buachaille sea stack in far distance, Sutherland, Scotland, United Kingdom, Europe

Rock formations at Sandwood Bay, with Am Buachaille sea stack in far distance, Sutherland, Scotland, United Kingdom, Europe

Giant's Causeway at sunset, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway at sunset, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Giant's Causeway at sunset, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Basalt columns of the Giant's Causeway at sunset, UNESCO World Heritage Site, County Antrim, Northern Ireland, United Kingdom, Europe

Toward Knabs Ridge and Menwith Hill from Little Alms Cliff near Beckwithshaw, Harrogate, North Yorkshire, Yorkshire, England, United Kingdom, Europe

Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

A bird's eye view of an idyllic island and healthy fringing reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.

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

The Grandes Rocques, Island of Guernsey, Bailiwick of Guernsey, British Crown dependency, English Channel, Europe

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

Sgwd Gwladys waterfall, Pyrddin Gorge, Pontneddfechan, Neath Valley, South Wales, United Kingdom, Europe

Tall hoodoo towers in the valley below Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North 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

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

Hoodoos in Bryce Canyon amphitheater after sunrise, Sunset Point, Bryce Canyon 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

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

Barren tree and rock formations near Skyline Arch, Arches National Park, Moab, Utah, United States of America, North America

Grand Canyon, Navajo Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Rock formation seen from John Ford Point, Monument Valley, Arizona, United States of America, North America

Rock formation of Spearhead Mesa at Artist's Point, Monument Valley, Arizona, United States of America, North America

Grand Canyon, Navajo Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Lipan Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Pima Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Pima Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, from Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Mohave Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The abandoned Rhosydd Slate Quarry backed by Cwmorthin and Allt y Ceffylau, Moelwyn Mountains, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

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

Slabs of brown sandstone on the summit of Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Hoodoo filled cliffs on the north side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

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

Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, 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

Atlantic surf rolls across granite shoreline rocks, at Porthgwarra Cove, near Land's End, in the far west of Cornwall, Great Britain.

Limestone cliffs and beach, Dunraven Bay, Southerndown, Vale of Glamorgan, South Wales, United Kingdom

The cliffs at Skomer Head, on the west coast of Skomer Island, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Cliffs viewed from Dun Aengus, prehistoric hill fort, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland