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Hiker takes a break on the Peekaboo Loop Trail in winter, with snowy red rocks and cliffs, Bryce Canyon National Park, Utah, United States of America, North America
Large hoodoo lit by early morning sun, with snow and pine trees, Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America
Windmill on Stagnone Lagoon in the salt pan area south of Trapani, with Mount Erice in the distance, Marsala, Sicily, Italy, Mediterranean, Europe
Hikers from the cablecar near the smoking summit of 3350m volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
Ash, rock and sulphur at the smoking summit of 3350m high volcano Mount Etna during an active phase, Mount Etna, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe
La Brea Pitch Lake, natural lake of tar rising from below with crust that can be walked on, near San Fernando, Trinidad, West Indies, Caribbean, Central America
Glaciar Serrano (Serrano Glacier), Ultima Esperanza Fjord, Puerto Natales, Patagonia, Chile, South America
Glaciar Serrano (Serrano Glacier), Ultima Esperanza Fjord, Puerto Natales, Patagonia, Chile, South America
Volcan Villarrica and Lao Villarrica at Pucon, Lakes District, southern Chile, South America
Glaciar Perito Moreno (Perito Moreno Glacier), Lago Argentino, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Glaciar Perito Moreno (Perito Moreno Glacier), Lago Argentino, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Cerro Torre, granite spire 1400 metres tall, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Torres del Paine, east faces of the granite towers, Torres del Paine National Park, Patagonia, Chile, South America
Glaciar Perito Moreno (Perito Moreno Glacier), Lago Argentino, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
Glaciar Perito Moreno (Perito Moreno Glacier), Lago Argentino, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America
The Fire Wave, Valley of Fire State Park, Nevada, United States of America, North America
Mesa Arch at dawn, Canyonlands National Park, Utah, United States of America, North America
View of Courthouse Towers, The Organ and Three Gossips at dawn, Arches National Park, Utah, United States of America, North America
The Mittens and Merrick Butte, Monument Valley Navajo Tribal Park, Utah, United States of America, North America
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Mount Mayon Volcano, Legazpi, south east Luzon, Philippines, Southeast Asia, Asia
Bodmin Moor, Cornwall, England, United Kingdom, Europe
Sulphur crystals on fumarole at Papandayan Volcano an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Sulphur encrusted fumaroles at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Sulphur encrusted fumarole at Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Green crater lake and steaming fumaroles at Papandayan Volcano, an active four cratered caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia
Morning Glory Pool and surrounds, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Cold tourists on seat surrounded by steam, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Dead trees and steam with mountain backdrop and blue skies, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Fallen lodgepole pines, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Fishing Cone Geyser with freezing mists, Yellowstone Lake at West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Glowing active volcanic crater of Volcan Telica on a starry night, with the Milky Way, Orion and the Pleiades, Leon, Nicaragua, Central America
Glowing active 700m wide volcanic crater of Volcan Telica with lava vents far below, in the North West volcanic chain, Leon, Nicaragua, Central America
Smoking 700m wide crater of Volcan Telica in the North West volcano chain, one of the country's most active volcanoes, Leon, Nicaragua, Central America
Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Rock and Spindle on the Fife Coast near St, Andrews, Fife, Scotland, United Kingdom, Europe
Visitor at Painted Wall View Point, Gunnison River deep in the canyon, Black Canyon of the Gunnison National Park, Colorado, United States of America, North America
Anti Atlas mountains between Tata and Tafraoute, Morocco, North Africa, Africa
Wadi Dana, Dana Nature Reserve, Jordan, Middle East
Tourists waiting to watch the full moon rise over the Valle de la Luna (Valley of the Moon), Atacama Desert, Norte Grande, Chile, South America
Hot air balloon flight over the famous volcanic tufa rock formations around Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Hot air balloon over the phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Volcanic tufa formations, known as fairy chimneys, Pasabag, near Zelve, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
Freshwater Bay and Tennyson Down from Afton Down, Isle of Wight, England, United Kingdom, Europe
The Wain Stones (Kissing Stones) on Bleaklow Moor, on the Pennine Way footpath, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Old Goris, Goris, Armenia, Central Asia, Asia
Preseli Hills (Mynyddoedd Y Preseli), source of Stonehenge bluestone megaliths, Pembrokeshire, Wales, United Kingdom, Europe
Reflections on a calm sea of the steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Fishing on the ice, Maloe More (Little Sea), frozen lake during winter, Olkhon island, Lake Baikal, UNESCO World Heritage Site, Irkutsk Oblast, Siberia, Russia, Eurasia
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
People relaxing in Blue Lagoon geothermal spa, Svartsengi Geothermal Power Station in the distance, Grindavik, Reykjanes Peninsula, Iceland, Polar Regions
Active lava eruption on the Tolbachik volcano, Kamchatka, Russia, Eurasia
Tufa towers in Mono Lake at twilight, California, United States of America, North America
Tufa towers in Mono Lake at twilight, California, United States of America, North America
Sunset over a tranquil Mono Lake in autumn California, United States of America, North America
Mono Lake tufa towers at sunset in autumn, California, United States of America, North America
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Gritstone rock formations amongst the heather clad moors of Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
Jenny Twigg and her daughter Tib, gritstone formations on heather covered moors, Upper Nidderdale, North Yorkshire, Yorkshire, England, United Kingdom, Europe
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe
Fosso Sinkhole, summit of Mount Roraima (Cerro Roraima), Tepuis, Venezuela, South America
Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe
Mount Lidgbird and Mount Gower at sunset, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
View of pier with Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific
Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific
Cliffs at Herald Island, UNESCO World Heritage Site, Chuckchi Sea, Russian Far East, Russia, Europe
Hoodoos, limestone features, Badlands, Drumheller area, Alberta, Canada, North America
Spectacular geological formations at Westcombe Beach in the South Hams, Devon, England, United Kingdom, Europe
Young woman enjoying the coast, Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America
A geological formation of dolomite located near Twyfelfontein, Namibia, Africa
Dawn rainbow above Holwell Tor in summer, Dartmoor, Devon, England, United Kingdom, Europe
Ponies graze in the summer sunshine beside Chinkwell Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Summer at Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Glastonbury Tor on a misty summer morning, Somerset, England, United Kingdom, Europe
Dartmoor Ponies shelter beside a granite outcrop in summer near Saddle Tor, Dartmoor National Park, Devon, England, United Kingdom, Europe
Glastonbury Tor rising surrounded by mist at dawn in summer, Somerset, England, United Kingdom, Europe
Glastonbury Tor on a misty morning in summer, Somerset, England, United Kingdom, Europe
Rainbow over Dartmoor at dawn in summer, Holwell Tor, Dartmoor, Devon, England, United Kingdom, Europe
Summer morning on a rocky outcrop near Saddle Tor in Dartmoor National Park, Devon, England, United Kingdom, Europe
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Leshan Grand Buddha (Giant Buddha), UNESCO World Heritage Site, Leshan, Lingyun Shan Mountain, Sichuan, China, Asia
Layered sandstone column under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America
Kaleto Rock Fortress, rock formations, Belogradchik, Bulgaria, Europe
Peace Monument, Caucasus Mountains, Border of Russia and Georgia, Central Asia, Asia
Interior, Shwe Oo Min natural Buddhist cave pagoda, Pindaya, Shan State, Myanmar (Burma), Asia
Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay
Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America
Motorway A7 road running through limestone desert, Paraje Natural de Karst en Yesos, Almeria, Andalusia, Spain, Europe
Hverfjall volcano crater at sunset, Myvatn, Iceland, Polar Regions
Beach near Terme Selinuntine, Sciacca, Agrigento district, Sicily, Italy, Mediterranean, Europe
Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America
Mud pots, fumaroles and dormant Volcan Santa Clara at the San Jacinto volcanic thermal area north of Leon, Leon, Nicaragua, Central America
Puu Hinahina Lookout, Waimea Canyon State Park, Kauai, Hawaii, United States of America, Pacific
Karst limestone formations and lagoon in Wayag Island with the photographer's kayak, Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia
Cenote Dzitnup, near Valladolid, Yucatan, Mexico, North America
Cenote Samula, near Valladolid, Yucatan, Mexico, North America