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Cave of Papafragas, Milos, Cyclades, Greek Islands, Greece
Cliff view of Dead Wash Valley in Petrified Forest National Park, at sundown, Arizona, United States of America
Three Natural Bridges of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia
Fog shrouds the volcanic mountains surrounding Cova de Paul on Santo Antao Island, Cape Verde, Africa
Stag rock, Bamburgh, Northumberland, England, United Kingdom
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
Aerial of Pia glacier and its fjord, Tierra del Fuego, Chile, South America
Scenic view of Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Playa Las Tumbas, Cabo San Antonio, Guanahacabibes Peninsular, National Park and Biosphere Reserve, Pinar del Rio Province, Cuba, West Indies, Central America
Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America
Mountains in the Andes near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America
Nevado Ausangate mountain in the Andes, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America
El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe
Chachani volcano, Arequipa Province, Arequipa Region, Peru, South America
El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe
Mountain stream with waterfall, Assynt, Highland, Scotland, United Kingdom, Europe
Looking towards Stac Pollaidh, Assynt, Highland, Scotland, United Kingdom, Europe
View over Guejar Sierra, Sierra Nevada, Granada, Andalusia, Spain, Europe
Rock formations in Guejar Sierra, Sierra Nevada, Granada, Andalusia, Spain, Europe
Patterns in the kelp at low tide on South Georgia Island, Southern Ocean
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
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
Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America
Castellana caves (Castellana Grotte), Apulia, Italy, Europe
Mountain scenery, Island of Corsica, France
Going down toward Santa Maria valley, Lucomagno area, Canton Ticino, Switzerland
Golden evening light on the limestone cliffs, Dunraven Bay, Southerndown, Vale of Glamorgan, Wales, United Kingdom
Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy
Laghi dei Plani (Plains Lakes), Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy
Lago dei Piani inferiore, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy
Messner Mountain Museum (MMM), Kronplatz (Plan de Corones), Dolomites, near Brunico (Bruneck), South Tyrol (Alto Adige), Italy
Messner Mountain Museum (MMM), Kronplatz (Plan de Corones), Dolomites, near Brunico (Bruneck), South Tyrol (Alto Adige), Italy
Mountain stream through a spruce forest, South Tyrol (Alto Adige), Italy
Summits of Alps viewed from an airplane over Europe
Cave of Papafragas, Milos, Cyclades, Greek Islands, Greece
Close to entrance to Jenny's Canyon, Snow Canyon State Park, near St. George, Utah, United States of America
Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America
Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America
Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America
A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America
A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America
An unnamed canyon that leads into Dead Wash at Petrified Forest National Park, Arizona, United States of America
An island of rock in an unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America
Patches of snow in the shade of a hill in 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
Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America
Dead Wash Valley in Petrified Forest National Park, Arizona, United States of America
Dead Wash Valley in Petrified Forest National Park, Arizona, United States of America
Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America
White chalk cliffs in Sarakiniko, Milos island, Cyclades, Greek Islands, Greece
Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America
Cliff view of Dead Wash Valley in Petrified Forest National Park, Arizona, United States of America
Looking down on the deep blue Katsura River, in the autumnal forests in Arashiyama of Kyoto, Honshu, Japan, Asia
Stack Rocks, Castlemartin, Pembrokeshire Coast, Wales, United Kingdom, Europe
Castellana caves (Castellana Grotte), Apulia, Italy, Europe
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
Delicate Arch at golden hour, Arches National Park, Moab, Grand County, Utah, 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 view of the island of La Gomera, the second smallest island in the Canary Islands, Spain, Atlantic, Europe
Aguila glacier, Tierra del Fuego, Chile, South America
Devil's Bridge, geological limestone rock formation and arch, Willikies, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central 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
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Three Natural Bridges of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia
Rock towers with coastal landscape of Sardinia in the background, Sardinia, Italy, Mediterranean, Europe
Marine fossils on rocks at the geological area Orti della Regina, Brenta Dolomites, Madonna di Campiglio, Trentino, Italy, Europe
A rock spire sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Crumbling islands of rock near Hamilili Point in Petrified Forest, 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
Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Geologists taking minerals samples on Gran Cratere (The Great Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe
The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America
The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe
Sulphur and fumaroles smoke on volcano Gran Cratere, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
A view of the volcanic crater of Cova de Paul on Santo Antao Island, Cape Verde, Africa
Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America
Cave in Dafines bay, Peninsula of Karaburun, within the Karaburun-Sazan Marine Parc, Vlore Bay, Albania, Europe
Castellana caves (Castellana Grotte), Apulia, Italy, Europe
Dades Gorges scenery, Morocco, North Africa, Africa
Delicate Arch at golden hour, Arches National Park, Moab, Grand County, Utah, United States of America, North America
Furnas Valley, a site of bubbling hot springs and fumaroles on the Azorean capital island of Sao Miguel, Azores, Portugal, Europe
Milky Way and person under Delicate Arch, Arches National Park, Moab, Grand County, Utah, United States of America, North America
Daisy Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America
Marble Cathedral, Santuario de la Naturaleza Capillas de Marmol, General Carrera Lake, Aysen Region, Patagonia, Chile, South America
Steam rising from side of Mount Tongariro, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Sunrise at Font's Point, Anza-Borrego Desert State Park, California, United States of America, North America
View from Calderon Honda crater of lava rock ruins and volcanic cones of the north, Lajares, Fuerteventura, Canary Islands, Spain, Europe
Gran Cratere (The Large Crater), Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Petrified wood and an eroded hill, Petrified Forest National Park, Arizona, United States of America, North America
Bedruthan Steps and Carnewas, Cornwall, England, United Kingdom, Europe
The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America
Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America
Green Bridge of Wales, Pembrokeshire Coast, Wales, United Kingdom, Europe
Sulphur and fumarole smoke on volcano Gran crater, Vulcano Island, Aeolian Islands, UNESCO World Heritage Site, north of Sicily, Italy, Mediterranean, Europe
A pointed peak of bentonite in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America