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Old copper mine buildings, preserved national historic site, Kennecott, Wrangel Mountains, Alaska, USA, North America

Elphreth's Alley, in historic Philadelphia (allegedly the oldest street in America), Pennsylvania, USA

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

Sandstone Wave, Paria Canyon, Vermillion Cliffs Wilderness, Arizona, United States of America (U.S.A.), North America

Snowboarder heads down, Paradise area, Mount Rainier, Washington State, United States of America (U.S.A.), North America

Sandstone formations in the Cathedral Gorge State Park, Nevada, United States of America, North America

Library of Congress, Washington D.C. (District of Columbia), United States of America, North America

Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cascades through moss-covered boulders, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

Red Rock Canyon National Conservation Area, Las Vegas, Nevada, United States of America, North America

Neptune Pool, Hearst Castle, San Simeon, San Luis Obispo County, California, United States of America, North America

Black Canyon of the Gunnison National Park, Gunnison River deep in the canyon, Colorado, United States of America, North America

An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America

North Michigan Avenue and Chicago Avenue signpost, The Magnificent Mile, Chicago, Illinois, United States of America, North America

Cyclist by Lake Michigan shore, Gold Coast district, Chicago, Illinois, United States of America, North America

Rock Art, Anthropomorph images, 600AD to 1250AD, Sego Canyon, Southern Utah, United States of America, North America

Western part of waterfall scar 120m high and 5km wide created by giant floods when Lake Missoula's ice dam was breached at end of Ice Age, Dry Falls, Grand Coulee, Washington state, United States of America, North America

Moshulu Sailing Ship, Penns Landing, Waterfront District, Philadelphia, Pennsylvania, United States of America, North America

Male Mountain Bluebird (Sialia currucoides) with food at the nest, Yellowstone National Park, Wyoming, United States of America, North America

The New York Stock Exchange, Wall Street, Manhattan, New York City, New York, United States of America, North America

The Statue of Liberty, Liberty Island, New York City, New York, United States of America, North America

Alpine Shooting Star (Dodecatheon alpinum), Yellowstone National Park, Wyoming, United States of America, North America

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

Tlingit Totem Pole, Raven's Fort Tribal House, Fort William Seward, Haines, Alaska, United States of America, North America

Interior of church, Mission San Xavier del Bac, Tucson, Arizona, United States of America, North America

Boulders and granite hills, Alabama Hills, Inyo National Forest, California, United States of America, North America

Alamo Square, with city skyline in background, San Francisco, California, United States of America, North America

Calliope hummingbird (Stellula calliope) perched, near Osoyoos, British Columbia, Canada, North America

Illuminated girl on sign at Glitter Gulch, Fremont Street, Las Vegas, Nevada, United States of America, North America

Delicate Arch in late afternoon, Arches National Park, Utah, United States of America, North America

Point Wilson Lighthouse, Vashon Island, Tacoma, Washington State, United States of America, North America

Close up of the wall at the Mayan ruins at El Palacio de los Mascarones (Palace of Masks), Kabah, Yucatan, Mexico, North America

Black bear (Ursus americanus) sow and two yearling cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tiradentes Plaza and Da Inconfidencia Museum, Ouro Preto, UNESCO World Heritage Site, Minas Gerais, Brazil, South America

Historic 530 Broadway, now the Courtyard Hotel, Gaslamp Quarter, San Diego, California, United States of America, North America

Sandhill crane (Grus canadensis), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Scree field on the side of a sandstone butte, Capitol Reef National Park, Utah, United States of America, North America

A low sun lights Brahma and Zoroaster temples and the cliff below Hopi Point with the metamorphic Vishnu basement rocks below, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Downtown and TransAmerica Building from Telegraph Hill Historic District, San Francisco, California, United States of America, North America

Half Dome from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Monument Valley Navajo Tribal Park, view from Artist Point, Merrick Butte (foreground), Utah, United States of America, North America

Hubbard Glacier in Yakutat Bay, Gulf of Alaska, Southeast Alaska, United States of America, North America

Black bear (Ursus americanus) cub of the year or spring cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Wilson Peak at dawn in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Box elder (boxelder maple) (maple ash) (Acer negundo) branch with yellow leaves in the fall, Capitol Reef National Park, Utah, United States of America, North America

Sharp-tailed grouse (Tympanuchus phasianellus) (previously Tetrao phasianellus), Custer State Park, South Dakota, United States of America, North America

The dutch houses at the Sint Annabaai in Willemstad, UNESCO World Heritage Site, Curacao, ABC Islands, Netherlands Antilles, Caribbean, Central America

Metra Train passing pedestrians at an open railroad crossing, Downtown, Chicago, Illinois, United States of America, North America

The unusual Aqua Tower designed by Jeanne Gang, Chicago, Illinois, United States of America, North America