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Bull elk (Cervus canadensis) bugling in the snow, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

The view to the southeast from Point Sublime after sunset, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

Close up of one of the world's rarest birds, Aldabra rail, last flightless bird of the Indian Ocean, Dryolinnas cuvieri aldabranus

The Great Mosque, the largest dried earth building in the world, a UNESCO World Heritage site, Djenne, Mali, Africa

Lake Louise, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

View from Pyramid of the Moon of the Avenue of the Dead and the Pyramid of the Sun in background, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

View from Pyramid of the Moon of the Avenue of the Dead and the Pyramid of the Sun in background, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Hiker on Tongariro Crossing trek by Blue Lake under winter ice and snow, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific

Aerial view of the South Rim, Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, USA, North America

Mont-Saint-Michel (Mont-St. Michel) at sunset, UNESCO World Heritage Site, La Manche Region, Basse Normandie (Normandy), France, Europe

Mont Saint-Michel (Mont-St. Michel) at sunset, UNESCO World Heritage Site, La Manche region, Basse Normandie (Normandy), France, Europe

Late winter hikers on snowfield in South Crater on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, South Auckland, North Island, New Zealand, Pacific

Cliff Geyser erupts from geyserite bank on edge of Firehole River through Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Silhouette of the temple of Angkor Wat reflected in the lake, UNESCO World Heritage Site, Angkor, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

Ancient drawings (petroglyphs) on sandstone rock, dating back 6000 years to the early stone age, of camels and also animals no longer found in the area, Twyfelfontein, UNESCO World Heritage Site, Namibia, Africa

Petroglyphs near Una Vida, Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Camel in front of the Taj Mahal and Yamuna (Jumna) River, Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh state, India, Asia

Camel and rider in front of the Taj Mahal and Yamuna (Jumna) River, Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh state, India, Asia

The Siq and facade of the Treasury (El Khazneh) (Al Khazna), Nabatean archeological site, Petra, UNESCO World Heritage Site, Jordan, Middle East

West Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

Simien Mountains Park Ranger, Dramatic mountain scenery from the area around Geech, UNESCO World Heritage Site, Simien Mountains National Park, The Ethiopian Highlands, Ethiopia, Africa

The Sunken Rock Hewn church of Bet Giyorgis (St George), Lalibela, Northern Ethiopia, Ethiopia, AfricaThe most famous of Lalibela's Rock Hewn churches, The Sunken Rock Hewn church of Bet Giyorgis, 'St. George', dating from the 12th Century, Lalibela's Rock Hewn Churches rank amoung the greatest religio-historical sites, not only in the African continent but in the Christian World

The Sunken Rock Hewn church of Bet Giyorgis (St George), Lalibela, Northern Ethiopia, Ethiopia, AfricaThe most famous of Lalibela's Rock Hewn churches, The Sunken Rock Hewn church of Bet Giyorgis, 'St. George', dating from the 12th Century, Lalibela's Rock Hewn Churches rank amoung the greatest religio-historical sites, not only in the African continent but in the Christian World

Bet Medhane Alem (Saviour of the World), Lalibela, Ethiopia, AfricaLalibelas rock-hewn churches are arguably Ethiopias top attraction, Bet Medhane Alem (Saviour of the World) is the largest rock-hewn church in the world, religious Hermits inhabit caves to this day, Known as Africas Petra

Bet Medhane Alem (Saviour of the World), Lalibela, Ethiopia, AfricaLalibelas rock-hewn churches are arguably Ethiopias top attraction, Bet Medhane Alem (Saviour of the World) is the largest rock-hewn church in the world, religious Hermits inhabit caves to this day, Known as Africas Petra

Bet Medhane Alem (Saviour of the World), Lalibela, Ethiopia, AfricaLalibelas rock-hewn churches are arguably Ethiopias top attraction, Bet Medhane Alem (Saviour of the World) is the largest rock-hewn church in the world, religious Hermits inhabit caves to this day, Known as Africas Petra

Bet Medhane Alem (Saviour of the World), Lalibela, Ethiopia, AfricaLalibelas rock-hewn churches are arguably Ethiopias top attraction, Bet Medhane Alem (Saviour of the World) is the largest rock-hewn church in the world, religious Hermits inhabit caves to this day, Known as Africas Petra

Black Carts, Roman Wall, Hadrian's Wall, UNESCO World Heritage Site, Northumberland (Northumbria), England, United Kingdom, Europe

Lake Quinault, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Father and son hike to Anderson Pass, Enchanted Valley, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Grass and maple trees in temperate rain forest, Queets River, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Pine trees, White Cloud scenic area, Huang Shan (Mount Huangshan) (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Pine tree, White Cloud scenic area, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Men watching sunrise, Huang Shan (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Silhouette of pine tree, White Cloud scenic area, Huang Shan (Mount Huangshan) (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Winter landscape, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rock climber, Halong Bay (Ha-Long Bay) (Ha Long Bay), UNESCO World Heritage Site, Vietnam, South China Sea, Indochina, Southeast Asia, Asia

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

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Sandy beach in front of the entrance to the New wonder of the world, the Puerto Princesa underground river, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Sandy beach in front of the entrance to the New wonder of the world and UNESCO World Heritage Site, the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia

Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

Outrigger cruising on the waters around the New wonder of the world and UNESCO World Heritage Site, the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia

Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia

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

Glacier ice melting and icebergs at Perito Moreno, Moreno Glacier, Parque Nacional Los Glaciares, UNESCO World Heritage Site, Patagonia, Argentina, South America

Aerial view of icebergs at Moreno Glacier (Perito Moreno), Parque Nacional Los Glaciares, UNESCO World Heritage Site, Patagonia, Argentina, South America

Backpacker crossing bridge, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Backpackers in steamy light, Queets Vall, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Hooker Lake and Glacier with icebergs and Mount Cook, Mount Cook National Park, UNESCO World Heritage Site, Canterbury region, South Island, New Zealand, Pacific

Tourists hiking on the Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Tourists hiking up to the Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Huge waterfall on the bottom of Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Moss-covered tree trunks in the rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Reflections of kasbah in river, Kasbah Ait Benhaddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Sunrise at Vermilion Lakes in the Canadian Rocky Mountains, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, 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

Looking east from Holbank Crags showing course of the Roman wall past Housesteads Wood to Sewingshields Crag, Hadrian's Wall, UNESCO World Heritage Site, Northumbria (Northumberland), England, United Kingdom, Europe

Looking west from Kings Hill to Housesteads Crag, Cuddy and Hotbank Crags, Hadrians Wall, UNESCO World Heritage Site, Northumberland (Northumbria), England, United Kingdom, Europe

Looking west from Kings Hill to Housesteads Roman Fort and crag, Cuddy and Hotbank Crags, Hadrians Wall, UNESCO World Heritage Site, Northumberland (Northumbria), England, United Kingdom, Europe

U Bein's Bridge across Thaungthaman Lake, at 1.2 km long the world's longest teak bridge, Amarapura, Myanmar (Burma), Asia

Boat on Thaungthaman Lake, and U Bein's Bridge, at 1.2 km long the world's longest teak bridge, Amarapura, Myanmar (Burma), Asia

Giant's Causeway, UNESCO World Heritage Site, Causeway Coast, Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Mount Ngauruhoe, 2287m, on the Tongariro Crossing, in the oldest national park in New Zealand, Tongariro National Park, UNESCO World Heritage Site, Taupo, North Island, New Zealand, Pacific

Hikers walking towards Barn Bluff on the overland track in Cradle Mountain Lake St. Clair National Park, part of Tasmanian Wilderness, UNESCO World Heritage Site, Tasmania, Australia, Pacific

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