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
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

Pena National Palace, built in 1840s for the Royal family, UNESCO World Heritage Site, Sintra, Portugal, Europe

Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central 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

Tarr Steps, an ancient clapper bridge in Exmoor National Park, Somerset, England, United Kingdom, Europe

Misty summer morning by Tarr Steps clapper bridge, Exmoor National Park, Somerset, England, United Kingdom, Europe

The Hubs, lottery-funded project originally National Centre for Popular Music, now Hallam University Students Union, Sheffield, Yorkshire, England

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

Petroglyph near Chetro Ketl, Chaco Culture National Historical Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Soldier riding a horse petroglyph, Chetro Ketl, Chaco Culture National Historical Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Tarr Steps, an ancient clapper bridge in Exmoor National Park, Somerset, England, United Kingdom, Europe

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

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

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

Looking north from Milecastle 37 to Broomlee Lough, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

Pueblo Bonito from 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

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

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

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

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

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

Templo Mayor, archaeological site of Aztec capital city of Tenochtitlan, Centro Historico, UNESCO World Heritage Site, Mexico City, Mexico, 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

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

Fierce gargoyle above archway, Pena National Palace, UNESCO World Heritage Site, Sintra, Portugal, Europe

Sintra National Palace, formerly the Royal or Town Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

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, Spruce Tree House, 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

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

Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America

Pavilion and waterfall at Tianyou Feng Heavenly Tour Peak in Mount Wuyi National Park, UNESCO World Heritage Site, Fujian Province, China, Asia

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

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

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

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

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

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

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

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

Banff, the Bow Falls and prestigious Banff Springs Hotel, at dusk, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

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

Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America

Sintra National Palace, formerly the Royal or Town Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

Milecastle 37 looking west, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

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

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

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

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

Petroglyphs near Una Vida, Chaco Culture National Historical Park, 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

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

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

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

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

Pu'ukohola Heiau National Historic Site, Big Island, Hawaii, 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

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

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

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

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

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

Chaco ruins in the Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, 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

Aerial view of hot air balloons over rock formations at sunrise, Goreme, Goreme Historical National Park, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia

Rock formations, Goreme, Goreme Historical National Park, Nevsehir District, Nevsehir Province, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia

Aerial view of rock formations in Love Valley at sunrise, Goreme, Goreme Historical National Park, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia

Aerial view of hot air balloons over rock formations at sunrise, Goreme, Goreme Historical National Park, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia

Aerial view of hot air balloon over rock formations in Love Valley at sunrise, Goreme, Goreme Historical National Park, UNESCO World Heritage Site, Cappadocia, Central Anatolia Region, Anatolia, Turkey, Asia Minor, Asia