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Rock formation, Courthouse Towers area, Arches National Park, Utah, United States of America, North America

Chicago River and towers including the Willis Tower, formerly Sears Tower, with a disused raised rail bridge in the foreground, Chicago, Illinois, 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

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

American alligator (Alligator mississippiensis), Everglades, UNESCO World Heritage Site, Florida, United States of America, North America

Snow forms, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Brooklyn Bridge and Manhattan skyline at dusk, New York City, United States of America, North America

San Francisco skyscraper night-time cityscape, San Francisco, California, United States of America, North America

A forest fire destroys an area of forest in Yosemite Valley in the Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Bison (Bison bison), Theodore Roosevelt National Park, North Dakota, United States of America, North America

The Old State House, 1713, now surrounded by modern towers in the Financial District, Boston, Massachusetts, USA

The United Nations Building, Manhattan, New York City, New York, United States of America, North America

Hopperstad Stave Church at the Hjemkomst Center, Moorhead City, Minnesota, United States of America, North America

Sand dunes at dusk, White Sands National Monument, New Mexico, United States of America, North America

Hoonah, shoreline and dock, Tlingit Community, summer, Icy Strait Point, Chichagof Island, Inside Passage, Southeast Alaska, United States of America, North America

Dutch architecture in Kralendijk capital of Bonaire, ABC Islands, Netherlands Antilles, Caribbean, Central America

Under one of the many steel bridges that cross the Chicago River, Chicago, Illinois, United States of America, North America

El train crossing Lake Street Bridge over the Chicago River, The Loop, Chicago, Illinois, United States of America, North America

Market Street Bridge and Tennessee Aquarium, Chattanooga, Tennessee, United States of America, North America

Outlook for the pinnacles in the beautiful rock formations of Bryce Canyon National Park, Utah, United States of America, North America

Grand Canyon of the Yellowstone River, from Inspiration Point, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Bison and Mount Washburn in early morning light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Undine Falls, near Mammoth Hot Springs, 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

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

The Old State House, 1713, now surrounded by modern towers in the Financial District, Boston, Massachusetts, USA

Business district, Lower Manhattan, New York City, New York, United States of America, North America

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

View of Central Park from south looking north, Manhattan, New York, New York State, United States of America, North America

Skyscrapers on West Wacker Drive and the Chicago River by the Franklyn Street Bridge, Chicago Illinois, United States of America, North America