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Petroglyphs near Una Vida, Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Pictograph Panel, Horseshoe Shelter Site, Barrier Canyon Style, Horseshoe Canyon, Canyonlands National Park, Utah, United States of America, North America

Pictograph Panel, Horseshoe Shelter Site, Barrier Canyon Style, Horseshoe Canyon, Canyonlands National Park, 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

Thingvellir national church, built in 1859 on the site of Iceland's first church constructed in 1000 AD, seen from Oxaraholmi, an island in the River Oxara, site of legal duelling in the past, Thingvellir National Park, UNESCO World Heritage Site, south-west Iceland (Sudurland), Iceland, Polar Regions

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

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

Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Adjacent Houses of Blackheads (Guildhall) and Schwab House, reconstructed in 1999 as a symbol of national resurgence, UNESCO World Heritage Site, Riga, Latvia, Europe

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

Vernazza in sunset light, Cinque Terre National Park, UNESCO World Heritage Site, Liguria, Italy, Mediterranean, Europe

Mesa Verde National Park, Spruce Tree House, UNESCO World Heritage Site, Colorado, 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

Rock art, zebra on a small outcrop, now used as the logo of Botswana's National Museums and Monuments, Tsodilo Hills, UNESCO World Heritage Site, Ngamiland, Botswana, Africa

Mesa Verde National Park, Fire Temple, UNESCO World Heritage Site, Colorado, 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

Castlerigg Stone Circle with Blencathra mountain behind, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

A pathway along the top of an overgrown section of Hadrians Wall through Housesteads Wood, UNESCO World Heritage Site, Northumberland National Park, England, United Kingdom, Europe

Mesa Verde National Park, Cliff Palace, 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

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

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

Moai heads of Easter island, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

Ancient fireplace stones, site of a 12th century camp of Ghengis Khan and his troops, Altyn-Emel National Park, Almaty region, Kazakhstan, Central Asia, Asia

Sculpture in Blackbeard's Castle, one of four National Historic sites in the US Virgin Islands, with Charlotte Amalie in the background, St. Thomas, U.S. Virgin Islands, West Indies, Caribbean, Central America

Mesa Verde National Park, Fire Temple, 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

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

Chapel in foreground and clocktower in background, Penna National Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

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

Watch Tower, Colorado River below, Desert View Point, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

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

View towards Warnscales Bothy, a mountain shelter near Buttermere, with Haystacks, Buttermere and Crummock Water in the background, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

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

Moai heads of Easter Island, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, Polynesia, South America

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, 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

Old Danish Customs House, Christiansted National Historic Site, Christiansted, St. Croix, US Virgin Islands, Caribbean

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

Mesa Verde National Park, Cliff Palace, 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

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

Overview, taken from High Cross Area, Penna National Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

House of Blackheads (a Guildhall) reconstructed in 1999 as a symbol of national resurgence, UNESCO World Heritage Site, Riga, Latvia, Europe

View east from Milecastle 37 approaching Housesteads Wood, Hadrians Wall, UNESCO World Heritage Site. Northumberland National Park, England, United Kingdom, Europe

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 13, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

Man in red coat stood holding out his arms looking at snow capped mountains, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Sculpture in Blackbeard's Castle, one of four National Historic sites in the US Virgin Islands, with Charlotte Amalie in the background, St. Thomas, U.S. Virgin Islands, West Indies, Caribbean, Central America

View of Grand Canyon west of the historic Watch Tower, managed by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Hungo Pavi, UNESCO World Heritage Site, New Mexico, United States of America, North America

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

Vernazza in sunset light, Cinque Terre National Park, UNESCO World Heritage Site, Liguria, Italy, Mediterranean, Europe

House of Blackheads (a Guildhall) reconstructed in 1999 as a symbol of national resurgence, UNESCO World Heritage Site, Riga, Latvia, Europe

The Great Kiva, Aztec Ruins National Monument, UNESCO World Heritage Site, New Mexico, United States of America, North America

Storage alcoves in the changing room of the Roman Baths, dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbrian National Park, England, United Kingdom, Europe

Chaco Culture National Historic Park, World Heritage Site, Fajada Butte, UNESCO World Heritage Site, New Mexico, United States of America, North America

Vernazza in sunset light, Cinque Terre National Park, UNESCO World Heritage Site, Liguria, Italy, Mediterranean, Europe

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

Chaco Culture National Historic Park, World Heritage Site, Casa Rinconada, UNESCO World Heritage Site, New Mexico, United States of America, North America

Desert View Watchtower, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Newt, mythical creature, Penna National Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

Sculpture in Blackbeard's Castle, one of four National Historic sites in the US Virgin Islands, with Charlotte Amalie in the background, St. Thomas, U.S. Virgin Islands, West Indies, Caribbean, Central America

Pu'ukohola Heiau National Historic Site, Big Island, Hawaii, United States of America, North America

Alte Nationalgalerie (Old National Gallery), Museum Island, UNESCO World Heritage Site, Mitte, Berlin, Germany, Europe

Chaco Culture National Historic Park, World Heritage Site, Hungo Pavi, UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Hungo Pavi, UNESCO World Heritage Site, New Mexico, United States of America, North America

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

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

The remains of slate mines near to the Tranearth site in the Lake District National Park, Cumbria, England, United Kingdom, Europe

The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Queens Terrace in foreground and Clock Tower, Penna National Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

North Pacific Cannery National Historic Site Museum, Prince Rupert, British Columbia, Canada, North America