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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

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

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

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

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

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

Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia

Panoramic view of the Vinales Valley showing limestone hills known as Mogotes, Vinales, UNESCO World Heritage Site, Cuba, West Indies, Central America

The Three Brothers reflected in the Merced River at dawn, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Valley View of El Capitan from the Merced River, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

El Capitan and Half Dome at sunset, from Tunnel View, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Black Oaks with spectacular autumnal colours in Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

Tranquil evening tones at Tenaya Lake, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Half Dome and fall foliage reflected in the Merced River, Yosemite Valley, Yosemiite National Park, UNESCO World Heritage Site, California, United States of America, North America

The Three Brothers reflected in the Merced River, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

The Three Brothers reflected in the Merced River, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Giant Sequoia trees (Sequoiadendron giganteum) in Mariposa Grove, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Evening sun setting on El Capitan above the Merced River, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Autumn scenery near the Merced River in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Jeffery Pine at Olmstead Point in autumn, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Galapagos blue-footed booby (Sula nebouxii excisa), North Seymour Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Red footed booby (Sula sula) in red mangrove, Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos brown pelican (Pelecanus occidentalis urinator), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Waved albatross (Phoebastria irrorata ), Hispanola Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Lava gull (Leucophaeus fuliginosus), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos Lava Lizard (Microlophus albemarlensis), Hispanola Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus californianus wollebaeki), Galapagos, UNESCO World Heritage Site, Ecuador, South America

Moraine Lake in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Moraine Lake in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Early morning sunrise, Lake Louise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Moraine Lake reflections in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Rock formations against a clear blue sky with mountains in the background, showcasing natural erosion and geological features in the Teide National Park,UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Free diving snorkeller and sunburst on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Hard and soft coral landscape scenic at Thetford Reef on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Scuba diver swimming with Gopro in coral landscape scenic at Thetford Reef on the Great Barrier Reef, UNESCO World Heritage Site, Cairns, Queensland, Australia, Pacific

Pool runoff of orange bacteria and algae (Therophiles), Grand Prismatic Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Steps leading down to Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Bison (Bison bison) bull in a spring snowstorm, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rainforest in Tully Gorge National Park, part of the Wet Tropics World Heritage Area, UNESCO World Heritage Site, near Ravenshoe, Queensland, Australia, Pacific

Striped sweetlips (diagonal banded sweetlips) (Plectorhinchus lineatus), North Ribbon Reef, Great Barrier Reef, UNESCO World Heritage Site, Queensland, Australia, Pacific

Cilantro Lodge at Emerald Lake in winter, Emerald Lake, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Emerald Lake Lodge in winter, Emerald Lake, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Sunset at Rigg Wood jetty on Coniston Water, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Norfolk Island shrouded in mist, Ullswater, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Autumn colours and clear reflections in Brothers Water, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Sunset over Catbells, Derwent Water and the Newlands Valley from Keswick, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Mount Fitz Roy and Cerro Torre at sunrise, Los Glaciares National Park, UNESCO World Heritage Site, El Chalten, Santa Cruz Province, Patagonia, Argentina, South America

Laguna Torre at sunset, Los Glaciares National Park, UNESCO World Heritage Site, Santa Cruz Province, Argentina, South America

Mountain range with Cerro Fitz Roy at sunrise reflected, Los Glaciares National Park, UNESCO World Heritage Site, El Chalten, Argentina, South America

Cathedral Rocks reflected in floodpools, Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

View of 16th century houses of Hallstatt, UNESCO World Heritage Site, on shore of Lake Hallstattersee, in Salzkammergut region, Austria, Europe

Windermere, Ambleside, morning light, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Cedar-Strip Canoe at Lake Louise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Cedar-Strip Canoe at Lake Louise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Ashness Pier Jetty with autumnal colours, Derwentwater, Keswick, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Derwentwater in autumn, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

A male wearing red coat stood in Maligne Canyon during winter conditions, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

A man wearing red coat stood in Maligne Canyon during winter conditions, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Lake Louise at Sunrise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadies Rockies, Canada, North America

Lake Louise at Sunrise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadies Rockies, Canada, North America

Sacred Cenote, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Cerro Torre, granite spire 1400 metres tall, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Columbia Icefield, Jasper National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Autumn foliage reflected in the Merced River, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Natural pinnacles in volcanic ash, Zemi Valley, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Princess of Wales conservatory glasshouses, Kew Gardens, Royal Botanic Gardens, UNESCO World Heritage Site, Kew, London, England, United Kingdom, Europe

Ashness Pier Jetty in autumn, Derwentwater, Keswick, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

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

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia

Galapagos blue-footed booby (Sula nebouxii excisa), North Seymour Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bison (Bison bison) bull in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America