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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

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

Moss-covered tree trunks in the rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, 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

Cerro Torre, granite spire 1400 metres tall, 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

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

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

Columbia Icefield, Jasper 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

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

Autumn foliage reflected in the Merced River, Yosemite Valley, Yosemite National Park, 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

The beehive-like mounds, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific

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

Warbler finch (Certhidea olivacea), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos blue-footed booby (Sula nebouxii excisa), North Seymour 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

Nazca booby (Sula granti), 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

Nazca booby (Sula granti), Hispanola Island, 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

Weston Park Museum and Mappin Art Gallery, opened 1875, Western Bank, Mushroom Lane, Sheffield, Yorkshire, England

Capela Nossa Senhora da Agonia (Chapel of Our Lady of Agony), Viana do Castelo, Minho-Lima, Portugal

View of Bom Jesus do Monte santuary immersed in the greenery of the surrounding woods, Braga, Minho Province, Portugal