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Dead tree trunks, Canary Spring, Main Terrace, Mammoth Hot Springs, Yellowstone National Park, UENSCO World Heritage Site, Wyoming, United States of America, North America

Eruption of Castle Geyser with rainbow in the spray, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Walls of China, a series of Lunettes in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

Yosemite Falls in full flow during spring in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Kiva in foreground, Step House Ruin, dates from 626AD to 1226AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Panoramic photo of view in late evening from Cape Royal, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Chaco ruins in the Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Bison in the Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Pronghorn buck (Antilocapra americana), Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of Lower Falls from Red Rock Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Thermal springs, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Early morning light at Pyramid Lake, Jasper National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Tourist boat at Iguazu Falls, Iguazu National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Banff Springs Hotel and Bow River near Banff, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Misty morning at Herbert Lake in the Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Medicine Lake in the Canadian Rockies, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Mammoth Hot Springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Field of Veitch's Bamboo in the Shiretoko Goko Lakes area, UNESCO World Heritage Site, Shiretoko National Park, Hokkaido, Japan, Asia

Boat harbour for vistitor boats in Shiretoko National Park, UNESCO World Heritage Site, Hokkaido, Japan, Asia

Lonscale Fell and Skiddaw reflected in the still water of Tewet Tarn in the Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Sunset over the Hoh River, Hoh Valley, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Cascade, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

Aerial of a huge fjord in Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

View to Mount Victoria across the emerald waters of Lake Louise, in summer, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

El Capitan and Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Cathedral Gorge in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle mountain range, Western Australia, Australia, Pacific

View over valley with colourful foliage in the Indian summer, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

Woman looking at a giant waterfall, Plitvice Lakes National Park, UNESCO World Heritage Site, Croatia, Europe

Reflection of mountains in Lake Gunn, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Reflection of mountains in Lake Gunn, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Man and woman gazing down into Mistaya Canyon in the Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Mount Teide, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Western Place of Arms, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Bison herd in early morning sun, Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Devil's Thumb and Palette Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

Madison River valley near Madison, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Medicine Lake, Jasper National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Reflections in Moraine Lake, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Cascade on the Kicking Horse River with orange rocks, Yoho National Park, UNESCO World Heritage Site, British Columbia, Canada, North America

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

Aerial view of Iguacu Falls, Iguacu National Park, UNESCO World Heritage Site, Parana, Brazil, South America

Badlands with clouds, Dinosaur Provincial Park, UNESCO World Heritage Site, Alberta, Canada, North America

Boat harbour for vistitor boats in Shiretoko National Park, UNESCO World Heritage Site, Hokkaido, Japan, Asia

A view of Yosemite Falls from the Valley Visitor Center in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Aerial of the colourful Tama Lakes in the Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Grand Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Wooden boardwalk and cyanobacteria thermophile formations on Geyser Hill, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

Sterkspruit Falls, Monk's Cowl Nature Reserve, Ukhahlamba-Drakensberg Park, UNESCO World Heritage Site, KwaZulu-Natal, South Africa, Africa

Los Roques and Mount Teide, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Overview of the great waterfall (Veliki Slap) and Sastavci waterfalls with mist rising, Plitvice Lakes National Park, UNESCO World Heritage Site, Croatia, Europe

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

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

Minor eruption from Steamboat Geyser, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Landscape in Northern Yellowstone from Grand Loop Road, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists at Iguazu Falls, Iguazu National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Spirit Island, Maligne Lake, Jasper National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Upper Athabasca River near Athabasca Falls, Jasper National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Log jam on Moraine Lake, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Kicking Horse River near Natural Bridge, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

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

Bayon, Angkor Thom, Angkor Archaeological Park, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

Elk (Cervus canadensis) (wapiti), South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

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

Saranda Kolones, Kato Paphos Archaeological Park, UNESCO World Heritage Site, Paphos, Cyprus, Eastern Mediterranean, Europe

Looking east from the Deer Park, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Los Roques and Mount Teide, Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Aerial photo of Grand Canyon from Papillon Helicopter, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bison in the Lamar Valley, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Panoramic photo of Beauty Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Run off area near Black Pool Spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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