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View across Nymph Lake at sunrise, with Hallett Peak above the trees, Rocky Mountain National Park, Colorado, United States of America, North America

Oak tree over the Semois River, Semois Valley, Belgian Ardennes, Luxembourg province, Wallonia region, Belgium, Europe

Water crowfoot (Ranunculus fluitans), The Semois River, Semois Valley, Belgian Ardennes, Wallonia region, Belgium, Europe

Dracaena cinnabari (the Socotra dragon tree) (dragon blood tree), Dixsam plateau on the island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle tree in bloom (Adenium obesum), endemic tree of Socotra, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle tree in bloom (Adenium obesum), endemic tree of Socotra, Homhil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle tree in bloom (Adenium obesum), endemic tree of Socotra, Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle trees in bloom (Adenium obesum), endemic tree of Socotra, Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Dracaena cinnabari (the Socotra dragon tree) (dragon blood tree) forest, Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle trees in bloom (Adenium obesum), endemic tree of Socotra, Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Frankincense trees (Boswellia elongata), Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Bottle tree in bloom (Adenium obesum), endemic tree of Socotra, Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Frankincense trees (Boswellia elongata), Homil Protected Area, island of Socotra, UNESCO World Heritage Site, Yemen, Middle East

Daisy Geyser, one of the most predictable, erupts at an angle, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Turban, Vent and Grand Geysers erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Early morning sunlight burns through mist at Holme Wood near Loweswater, Lake District National Park, Cumbria, England, United Kingdom, Europe

Ancient beech tree avenue at Kingston Lacy in spring, Badbury Rings, Dorset, England, United Kingdom, Europe

Winding Lake District footpath through Holme Wood in autumn, Loweswater, Lake District National Park, Cumbria, England, United Kingdom, Europe

Kingston Lacy Beech lined avenue with road near Badbury Rings, Dorset, England, United Kingdom, Europe

Road through mist shrouded deciduous woodland in autumn, near Lamorna, Cornwall, England, United Kingdom, Europe

Remains of gunpowder mills at Kennall Vale Nature Reserve in Ponsanooth near Falmouth, Cornwall, England, United Kingdom, Europe

View towards Youlgreave from the slopes of Lathkill Dale in spring, Peak District National Park, Derbyshire, England, United Kingdom, Europe

River weed and marsh marigolds (Caltha Palustris) of Lathkill Dale in spring, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Erosion pattern in yellow sandstone under patterned clouds, Valley of Fire State Park, Nevada, United States of America, North America

Red sandstone with three-dimensional erosion forms, Gold Butte, Nevada, United States of America, North America

Pillar arch in yellow sandstone, Valley of Fire State Park, Nevada, United States of America, North America

Crater Lake and Wizard Island at dawn, Crater Lake National Park, Oregon, United States of America, North America

Mud bubbles in a mud field in the Te Puia Maori Cultural Center, Rotorura, North Island, New Zealand, Pacific

The colourful multi hued Champagne Pool, Wai-O-Tapu Thermal Wonderland, Waiotapu, North Island, New Zealand, Pacific

Pa'rus Trail winds through Zion Canyon in winter, Zion National Park, Utah, United States of America, North America

Tourists hiking above a giant crack on Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific

Tourists hiking above a giant crack on Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific

Hoodoos and snow lit by strong dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos lit by late afternoon sun with snow, from Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snowy rim cliffs lit by late afternoon sun, winter, near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snow lit by strong dawn light, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos lit by late afternoon sun with snowy backdrop, from Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snow lit by strong late afternoon sun in winter, near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snow lit by strong dawn light, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA

Hoodoos, rim and snow lit by strong dawn light, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Rocks lit by late afternoon sun with snow, from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Rocks lit by strong dawn light, snowy backdrop, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos backlit by winter early morning sun, Queen's Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Red-hued limestone arch lit by morning sun with snowy cliffs in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Red-hued limestone arch lit by morning sun with snow in winter at Natural Bridge, Bryce Canyon National Park, Utah, United States of America, North America

Pink and green aurora borealis (Northern Lights) photographed reflected in the sea near Tromso, Norway, Scandinavia, Europe

Spring flowers and 659m limestone Monte Cefano, a Nature Reserve and hiking and climbing spot northeast of Trapani, Custonaci, Sicily, Italy, Mediterranean, Europe

Spring flowers in Zingaro Nature Reserve near Scopello on this north west coast, known for its beauty, Scopello, 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

Agave succulent plant and active volcano 3350m Mount Etna seen at this northeast tourist town, Taormina, Catania Province, 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

Glaciar Perito Moreno (Perito Moreno Glacier), Lago Argentino, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Tree distorted by winds of the Roaring Forties, Harberton, Ushuaia, Beagle Channel, Tierra del Fuego, 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

Rio Serrano and Los Cuernos del Paine, 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

Flowering cherry trees in blossom along Harper Avenue, Hagley Park, Christchurch, Canterbury, South Island, New Zealand, Pacific

Sun breaking through the clouds, Queen Elizabeth National Park in front of the Rwenzori Mountains, Uganda, East Africa, Africa

An adult polar bear (Ursus maritimus) on the edge of a huge iceberg in Arctic Harbour, Isabella Bay, Baffin Island, Nunavut, Canada, North America

Adult polar bear (Ursus maritimus) on ice floe, Cumberland Peninsula, Baffin Island, Nunavut, Canada, North America

Paradise Island Lighthouse, Nassau Harbour, New Providence Island, Bahamas, West Indies, Central America

Vermilion Lakes, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

The green light of the Northern Lights (aurora borealis) lights up fishermans cabins, Hamnoy, Lofoten Islands, Arctic, Norway, Scandinavia, Europe

Northern Lights (aurora borealis) and mountains reflected in the cold waters, Skagsanden, Lofoten Islands, Arctic, Norway, Scandinavia, Europe