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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

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

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

The McMath Solar Telescope, Kitt Peak National Observatory, Arizona, United States of America, North America

The River Cafe at Fulton Ferry Landing, Manhattan Bridge beyond, Brooklyn, New York City, New York, 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

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

Pittsburgh skyline and the Allegheny River, Pittsburgh, Pennsylvania, United States of America, North America

Takakkaw Falls, Yoho National Park, UNESCO World Heritage Site, British Columbia, Rocky Mountains, Canada, North America

Elk River Falls at sunset, Elk River, Blue Ridge Mountains, North Carolina, United States of America, North America

Gateway Bridge over the Cumberland River, Nashville, Tennessee, United States of America, North America

One of the two iconic bronze lion statues outside the Art Institute of Chicago, Chicago, Illinois, 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

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

View over Sao Francisco Monastery, UNESCO World Heritage Site, Olinda, Pernambuco, Brazil, South America

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

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

Petrified Tree near Tower-Roosevelt, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lake Minnewanka, Banff National Park, UNESCO World Heritage site, Alberta, Rocky Mountains, Canada, North America

Oakland Bay Bridge and Fire Rescue Boat, San Francisco, California, United States of America, North America

Mission Dolores, The oldest building in San Francisco founded in 1776, San Franscisco, California, USA

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

Inner Harbour with Parliament Building at night, Victoria, Vancouver Island, British Columbia, Canada, North America

View from Sulphur Mountain to Banff, Banff National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Trunks of lodgepole pines on Blacktail Deer Plateau, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

A 1950s car and rickshaw pass the Capitolio in central Havana, Cuba, West Indies, Caribbean, Central America

Step pyramid in the great plaza, Mayan archaeological site, Copan, Western Highlands, Honduras, Central America

The Manhattan skyline from the Brooklyn Bridge, post Sept 11, New York City, New York State, USA, North America

Grand Canyon from the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, USA, North America

Cuban flag flying outside the Ministerio del Interior, Plaza de la Revolucion, Havana, Cuba, West Indies, Central America

The red brick Old State House, with its white tower, with office buildings in the background, Boston, Massachusetts, New England, United States of America, North America

Pyramid of the Sun, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Cliff palace ruins dating from 1200-1300 AD shaded in limestone overhang, Mesa Verde, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America (U.S.A.), North America

Half Dome mountain peak and chapel, built in 1879, the oldest building still in use, Yosemite National Park, UNESCO World Heritage Site, California, United States of America (USA), North America

Ruins of Inca city, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

Ruins of Inca city, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

Tourists looking out over the ruins of the Inca site, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

Ruins of Inca city in morning light, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

Exterior of the Christian cathedral, Cuzco Ciity (Cusco), UNESCO World Heritage Site, Peru, South America

Fountain and the Christian cathedral beyond, Cuzco Ciity (Cusco), UNESCO World Heritage Site, Peru, South America

Ruins of Inca city, Machu Picchu, UNESCO World Heritage Site, Urubamba Province, Peru, South America

The Inca Bridge (Puente del Inca) at sunset, Central Andes, Mendoza Province, Argentina, South America

Plaza de la Republica, the Obelisk and world's widest avenue, Avenida 9 de Julio, Buenos Aires, Argentina, South America