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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

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

Waterfall, Milford Sound, Fiordland National Park, UNESCO World Heritage Site, Southland, South Island, New Zealand, Pacific

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

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

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

Pelicans in front of catamaran, Laughing Bird Caye National Park, UNESCO World Heritage Site, Belize, Central America

Milford Sound, Fiordland National Park, UNESCO World Heritage Site, Southland, South Island, New Zealand, Pacific

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

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

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

Charioteer and horses, painted tomb slab detail, National Archaeological Museum, Paestum, UNESCO World Heritage Site, Campania, Italy, Europe

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

Totem pole at Gwaii Haanas National Park Reserve and Haida Heritage Site, British Columbia, Canada, North America

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

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

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

Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America

The Domes, Bungle Bungle, Purnululu National Park, UNESCO World Heritage Site, Kimberley, Western Australia, Australia, Pacific

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

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

Hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

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

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

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

Detail of Pena National Palace, built in 1840s for the Royal family, UNESCO World Heritage Site, Sintra, Portugal, Europe

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

Grand Canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Eruption of Castle Geyser with thermophilic bacterica mats in foreground, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Rainbow over waterfall, Milford Sound, Fiordland National Park, UNESCO World Heritage Site, Southland, South Island, New Zealand, Pacific

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

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

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

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

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

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

The National Gallery and St. Martins in the Fields church in Trafalgar Square, London, England, United Kingdom, Europe

Cake Rock on Rialto Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

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

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

Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

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

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

Crowds of spectators watching Old Faithful Geyser erupting, Upper Geyser Basin, 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

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

Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America

Milke Trnine waterfall overhung by trees at Plitvice Lakes National Park, UNESCO World Heritage Site, Croatia, Europe

Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

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

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

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

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

Echinus Geyser, erupts every hour in Norris Basin, 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

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

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

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

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

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

View from Ublrr Rock, aboriginal rock art site, part of the sandstone escarpment on park border, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

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

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

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

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

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

Travertine calcite deposits on the Canary Spring terraces, Mammoth Hot Springs and Terraces, 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

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

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

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

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