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The Great Stelae, 22m, believed to be the largest single stone block humans have tried to erect, Northern Stelae Park, Aksum, UNESCO World Heritage Site, Ethiopia, Africa

The spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park, Wulingyuan Scenic Area, UNESCO World Heritage Site, Hunan, China, Asia

Dry river and beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific

Tourists on a elephant watching Asian water buffalo (Bubalus bubalis), Kaziranga National Park, UNESCO World Heritage Site, Assam, Northeast India, India, Asia

Ducks by fountain and Conservatory on River Thames, Royal Botanic Gardens, UNESCO World Heritage Site, Kew, near Richmond, Surrey, England, United Kingdom, Europe

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific

View from the Three Sisters of Jamison valley under fog, Blue Mountains National Park, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Bow River and railway at Morant's Curve, from Bow Valley Parkway, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

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

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

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

The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Mount Cook, highest mountain in Australasia, Mount Cook National Park, UNESCO World Heritage Site, Canterbury, South Island, New Zealand, Pacific

Elk (Cervus canadensis) with tourists along the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fly fisherman casting in the early morning fog in the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Icicles on the face of the Athabasca Glacier, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Indian rock carving, Writing-on-Stone Provincial Park, UNESCO World Heritage Site, Alberta, Canada, North America

Terraced fields near Ambikwa village, Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Great Blue Heron, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

A family walking the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tourist looking at the Trafalgar Falls, Morne Trois Pitons National Park, UNESCO World Heritage Site, Dominica, West Indies, Caribbean, Central America

Uluru, UNESCO World Heritage Site, Uluru-Kata Tjuta National Park, Northern Territory, Australia, Pacific

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Orangery, with Olympic themed garden, Royal Botanic Gardens, UNESCO World Heritage Site, Kew, near Richmond, Surrey, England, United Kingdom, Europe

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Debirichwa village in early morning, Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Shepherds at Geech Camp, Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Woman taking photos, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Motorhome below Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, South Pacific

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

The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Bison walk through winter storm, Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

River, Milford Track, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Indian Rhinoceros (Rhinoceros unicornis), Kaziranga National Park, UNESCO World Heritage Site, Assam, Northeast India, India, Asia

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tourists viewing the Morning Glory Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Emerald Lake, Yoho National Park, UNESCO World Heritage Site, British Columbia, Canada, North America

Steam plumes from hot lava flowing onto the beach and hitting the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii ('Big Island'), Hawaii, United States of America, North America

Palm trees at approach to Echidna chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

Routeburn Track, Hollyford Valley, Pops view towards Humbolt mountains, Milford Road World Heritage Highway, Fiordland National Park, South Island, New Zealand, Pacific

Rano Raraku, volcanic crater from which numerous moai (statues) were carved, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, Pacific, South America

Hikers walking through a lava field on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Hikers at Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Pueblo ruins in Mesa Verde containing some of the most elaborte Pueblo dwellings found today, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

The Olgas, Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Visitors on a viewing platform on Sulphur Mountain summit overlooking Banff National Park, UNESCO World Heritage Site, Alberta, The Rockies, Canada, North America

Cow moose feeding in Moose Lake, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Oxara River tumbles down the Almannagja cliff face at Oxarafoss, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions

Pico del Teide, 3718m, the highest mountain in Spain, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Tourists looking at Moreno Glacier, Park National Los Glaciares, UNESCO World Heritage Site, Argentina, South America

Tourists cross flood scoured rocks, past typical formations, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific

Blisters measuring about 10 cm across in boiling mud pool, Mud volcano, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Debirichwa village in early morning, Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Geysers in Yellowstone National Park, UNESCO World Heritage Site, Montana, United States of America, North America

Mount Cook and Mount Cook Road with rental car, Mount Cook National Park, UNESCO World Heritage Site, Canterbury region, South Island, New Zealand, Pacific

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

View from Greenwich Park overlooking the Royal Maritime Museum, UNESCO World Heritage Site, with Docklands and Canary Wharf on the other side of the Thames, London, England, United Kingdom, Europe

Tourists on elephants, Kaziranga National Park, UNESCO World Heritage Site, Assam, Northeast India, India, Asia

Sycamore trees (Acer pseudoplatanus) and waterfalls fringe Milanovac Lake, Plitvice Lakes National Park, UNESCO World Heritage Site, Croatia, Europe

The Cascade, Caserta la Reggia (Regia di Caserta), UNESCO World Heritage Site, in Campania, Italy, Europe

The Hayden Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Waterfall cascades over rock wall at Rainbow Falls in the Yosemite Park, UNESCO World Heritage Site, California, United States of America, North America

Hikers on Tongariro Crossing trek, Emerald Lakes in geothermal area, Tongariro National Park, UNESCO World Heritage Site, Taupo, North Island, New Zealand, Pacific

Geothermal steam from geyser vent between eruptions, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Swamps, Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

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

Foz de Iguazu (Iguacu Falls), Iguazu National Park, UNESCO World Heritage Site, Argentina, South America

Thingvellir national church and Thingvallabaer, a five-gabled farmhouse, official summer residence of Iceland's Prime Minister, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions

Cawfield Farm from Thorney Doors Cawfields Crags looking west, Walltown Crags on the horizon, Hadrians Wall, UNESCO World Heritage Site, Northumbrian National Park, Northumbria, England, United Kingdom, Europe

Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

Hot air balloons flying among rock formations at sunrise in the Red Valley, Goreme National Park, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

The Bergpark Wilhelmshoehe, a landscape park, UNESCO World Heritage Site, Kassel, Hesse, Germany, Europe

The Royal Observatory, Greenwich Park, UNESCO World Heritage Site, Greenwich, London, England, United Kingdom, Europe

The Yellow Water wetlands on floodplain of the Alligator River, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Mesas and spires of Simien Range, Simien Mountains National Park, UNESCO World Heritage Site, Ethiopia, Africa

Emerald Lake, Yoho National Park, UNESCO World Heritage Site, British Columbia, The Rockies, Canada, North America

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

Echidna Chasm Walk, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific