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Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Cliff dwellings constructed over 700 years ago, Gila Cliff Dwellings National Monument, New Mexico, United States of America, North America

Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Bas relief sculpture depicting the city's early history, Michigan Avenue Bridge, Chicago, Illinois, United States of America, North America

Old Hook Windmill, East Hampton, The Hamptons, Long Island, New York State, United States of America, North America

Sumter Monument in The Battery, White Point Gardens, Charleston, South Carolina, United States of America, North America

Copy of The Declaration of Independence in Free Quarker Meeting House, Independence National Historical Park, Philadelphia, Pennsylvania, United States of America, North America

Copy of The Declaration of Independence in Free Quarker Meeting House, Independence National Historical Park, Philadelphia, Pennsylvania, United States of America, North America

Tomb of the Unknown Soldier, Washington Square, Philadelphia, Pennsylvania, United States of America, North America

City skyline including the Chrysler Building at dusk, Manhattan, New York, United States of America, North America

Wide angle view of the city skyline including the Chrysler Building and Empire State Building from the UN Plaza Hotel, early morning, Manhattan, New York, United States of America, North America

Manhattan Bridge and Empire State Building in the distance, DUMBO, Brooklyn, New York City, New York, United States of America, North America

Manhattan Bridge and Empire State Building in the distance, DUMBO, Brooklyn, New York City, New York, United States of America, North America

Brooklyn Bridge spanning the East River from Fulton Ferry Landing, Brooklyn, New York City, New York, United States of America, North America

Flatiron Building, Fifth Avenue and Broadway, Manhattan, New York City, New York, United States of America, North America

Empire State Building and Manhattan cityscape at dusk, New York City, New York, United States of America, North America

Empire State Building and Manhattan cityscape, New York City, New York, United States of America, North America

Empire State Building and Manhattan cityscape, New York City, New York, United States of America, North America

The Imagine Mosaic memorial to John Lennon who lived nearby at the Dakota Building, Strawberry Fields, Central Park, Manhattan, New York City, New York, United States of America, North America

The Imagine Mosaic memorial to John Lennon who lived nearby at the Dakota Building, Strawberry Fields, Central Park, Manhattan, New York City, New York, United States of America, North America

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

View of Statue of Liberty from rear of boat with Stars and Stripes flag, New York, United States of America, North America

Statue of Father Damien sainted for his work at Kalaupapa leper colony, Oahu Island, Hawaii, United States of America, North America

Pima County Courthouse and skyscrapers, Tucson, Pima County, Arizona, United States of America, North America

Close-up, low angle view of the Statue of Liberty, Liberty Island, New York City, United States of America, North America

Statue of George M. Cohan, composer of Give My Regards to Broadway, Times Square at dusk, Manhattan, New York City, New York, United States of America, North America

The Soldiers and Sailors Monument, erected by William Clark Noble in 1890 to honour the fallen of the American Civil War at Congdon Park on Broadway in historic Newport, Rhode Island, New England, United States of America, North America

Entrance to the Smithsonian Castle with statue of Joseph Henry outside on the Mall in Washington, D.C., United States of America, North America

Statue of a Great Depression bread line at the Franklin D. Roosevelt Memorial, Washington, D.C., United States of America, North America

Statue of a Great Depression bread line at the Franklin D. Roosevelt Memorial, Washington, D.C., United States of America, North America

The Martin Luther King Memorial on the National Mall in Washington, D.C., United States of America, North America

San Francisco de Asis Mission Church, National Historic Landmark, established 1772, Ranchos de Taos, New Mexico, United States of America, North America

Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America

Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America

Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America

Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America

Petrified logs from the late Triassic period, 225 million years ago, Long Logs Trail, Petrified Forest National Park, Arizona, United States of America, North America

Agate Bridge, a petrified log spanning ravine, Petrified Forest National Park, Arizona, United States of America, North America

San Xavier del Bac Mission, founded in 1692, National Historic Landmark, Tohono O'odham San Xavier Indian Reservation, Arizona, United States of America, North America

San Jose de Tumacacori Mission, established in 1691, Tumacacori National Historic Park, New Mexico, United States of America, North America

San Xavier del Bac Mission, founded in 1692, National Historic Landmark, Tohono O'odham San Xavier Indian Reservation, Arizona, United States of America, North America

Casa Grande (Great House) Ruins National Monument, home to the Sonora Desert people, founded near 400 AD, abandoned about 1450 AD, Coolidge, Arizona, United States of America, North America

Cliff dwelling of Southern Sinagua farmers, built in the early 1100s CE (Common Era), a five storey, 20 room structure, Montezuma Castle National Monument, Arizona, United States of America, North America

Cliff dwelling of Southern Sinagua farmers, built in the early 1100s CE (Common Era), a five storey, 20 room structure, Montezuma Castle National Monument, Arizona, United States of America, North America

Casa Grande (Great House) Ruins National Monument, home to the Sonora Desert people, founded near 400 AD, abandoned about 1450 AD, Coolidge, Arizona, United States of America, North America

Quarai Mission, building began around 1628, Salinas Pueblo Missions National Monument, New Mexico, United States of America, North America

Lomaki Pueblo, inhabited from approximately 1100 AD to 1250 AD, Wupatki National Monument, Arizona, United States of America, North America

Ruins of Ancestral Puebloans, Square Tower, dating from between 900 AD and 1200 AD, Holly Group, Hovenweep National Monument, Utah, United States of America, North America

Anasazi Ruins, Square Tower House, dating from between 600 AD and 1300 AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Anasazi Ruins, Cliff Palace, dating from between 600 AD and 1300 AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Mesa Verde National Park, Spruce Tree House, UNESCO World Heritage Site, Colorado, United States of America, North America

Mesa Verde National Park, Fire Temple, UNESCO World Heritage Site, Colorado, United States of America, North America

Mesa Verde National Park, Fire Temple, UNESCO World Heritage Site, Colorado, United States of America, North America

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America

Petroglyphs on Newspaper Rock, Newspaper Rock Recreation Area, Utah, 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

Chaco Culture National Historic Park, World Heritage Site, Fajada Butte, 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

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

Chaco Culture National Historic Park, World Heritage Site, Fajada Butte, 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

West Ruin, Aztec Ruins National Monument, dating from between 850 AD and 1100 AD, UNESCO World Heritage Site, New Mexico, United States of America, North America

Anasazi Ruins, Cliff Palace, dating from between 600 AD and 1300 AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, 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

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, 200 year old rock paintings of the Spanish , 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, Blue Bull Cave, pictographs, 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

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

Interior of Navajo hogan, traditional dwelling and ceremonial structure, Monument Valley Navajo Tribal Park, Utah, United States of America, North America

Bighorn Sheep at the Sun's Eye. Anasazi Petroglyphs, Monument Valley Navajo Tribal Park, Utah, United States of America, North America