Foz de Iguazu (Iguacu Falls), the largest waterfalls in the world, Iguacu National Park, UNESCO World Heritage Site, Brazil, South America

Fresco of the Poppea Villa (Villa Poppaea), Oplontis, UNESCO World Heritage Site, Campania, Italy, Europe

Lonja de la Seda (Llotja de la Seda) (Silk Exchange), UNESCO World Heritage Site, Valencia, Spain, Europe

The souk in the Medina, UNESCO World Heritage Site, Essaouira, Atlantic coast, Morocco, North Africa, Africa

Tourist at Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Cultural Triangle, Sri Lanka, Asia

Temple No. 2 (Temple of the Masks), Great Plaza, Tikal, UNESCO World Heritage Site, Tikal National Park, Peten, Guatemala, Central America

Trail between Namche Bazaar and Everest View Hotel, with Mt. Thamserku behind, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Clock tower at dusk, Stradun, UNESCO World Heritage Site, Dubrovnik, Dalmatian Coast, Dalmatia, Croatia, Europe

Mosaic depicting Infancy of Christ, interior of Church of St. Saviour in Chora (Kariye Camii), UNESCO World Heritage Site, Istanbul, Turkey, Europe

Hagia Sophia (Aya Sofya Mosque) (The Church of Holy Wisdom), UNESCO World Heritage Site, at sunrise, Istanbul, Turkey

Red Fort, UNESCO World Heritage Site, Delhi, India, Asia

eneralife Palace, Generalife Gardens, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture, World Heritage Site, UNESCO,

Group of hikers walking up to Mount Etna summit, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Mount Etna cable car, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Group of hikers walking up to Mount Etna summit, UNESCO World Heritage Site, Etna, Sicily, Italy, Mediterranean, Europe

Saint-Benezet bridge dating from the 12th century, and the Palais des Papes, UNESCO World Heritage Site, across the Rhone river, Avignon, Vaucluse, France, Europe

Cloisters collonade marble columns, historic courtyard of Evora University, Evora, UNESCO World Heritage Site, Alto Alentejo, Portugal, Europe

Historic 16th century church of Saint Francis (Igreja de Sao Francisco), built in Gothic style, with Manueline influences, completed around 1510, design of Martim Lourenco, city of Evora, UNESCO World Heritage Site, Alto Alentejo, Portugal, Europe

The statue of the Mermaid, Rynek (Old Market Place), UNESCO World Heritage Site, Warsaw, Poland, Europe

The statue of the Mermaid, Rynek (Old Market Place), UNESCO World Heritage Site, Warsaw, Poland, Europe

Tents at Everest Base Camp at night, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Angkor Wat Temple complex, UNESCO World Heritage Site, Angkor, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

Casa Batllo, UNESCO World Heritage Site, Barcelona, Catalonia, Spain, Europe

Nasrid Palaces, World Heritage Site, UNESCO, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture

Mirador de San Nicolas, World Heritage Site, UNESCO, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture

Mirador de San Nicolas, World Heritage Site, UNESCO, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture

Zvartnots archaeological ruin, UNESCO World Heritage Site, Mount Ararat in Turkey behind, Armenia, Caucasus, Central Asia, Asia

Machu Picchu Incan Ruins, UNESCO World Heritage Site, Sacred Valley, Peru, South America

Casa Batllo, modernism design by Antoni Gaudi, UNESCO World Heritage Site, old town, Barcelona, Catalonia, Spain, Europe

Kniphofia (Tritoma) (Red hot poker) (Kniphofia foliosa), Simien Mountains National Park, UNESCO World Heritage Site, Amhara region, Ethiopia, Africa

Street scene in Purmamarca with the Mountain of Seven Colors in the background, Purmamarca, Quebrada de Humahuaca, UNESCO World Heritage Site, Jujuy Province, Argentina, South America

Horse carriage for tourists, Zona Colonial (Colonial District), UNESCO World Heritage Site, Santo Domingo, Dominican Republic, West Indies, Caribbean, Central America

Mayan ruins, Calakmul, UNESCO World Heritage Site, Calakmul Biosphere Reserve, the largest tropical forest reserve in Mexico, Campeche, Mexico, North America

Interior fresco of The Last Supper, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Mirror reflections at Herbert Lake in the Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, 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

El Castillo pyramid (Temple of Kukulcan) in the ancient Mayan ruins of Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Hadrians Wall near Cawfields Quarry, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Elevated view of the Jinshanling and Simatai sections of the Great Wall of China, Unesco World Heritage Site, China, East Asia

Stained glass windows, Sagrada Familia, UNESCO World Heritage Site, Barcelona, Catalonia, Spain, Europe

Johnston Canyon Creek, Banff National Park, Alberta, UNESCO World Heritage Site, Canada, North America

Nasrid Palaces, World Heritage Site, UNESCO, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture

eneralife Palace, Generalife Gardens, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture, World Heritage Site, UNESCO,

eneralife Palace, Generalife Gardens, Alhambra, Granada, Andalusia, Spain, Islamic architecture, Mudejar architecture, World Heritage Site, UNESCO,

Medieval stained glass of The Crucifixion, Corona Redemption Window, East End, Corona I, Canterbury Cathedral, UNESCO World Heritage Site, Canterbury, Kent, England, United Kingdom, Europe

Newly restored section of the Great Wall of China, UNESCO World Heritage Site, Mutianyu, Beijing District, China, Asia

Historic City of Sucre seen from Iglesia Nuestra Senora de La Merced (Church of Our Lady of Mercy), UNESCO World Heritage Site, Bolivia, South America

Durdle Door, Dorset, Jurassic Coast, UNESCO World Heritage Site, England, United Kingdom, Europe

Tourist taking a photograph, Temple of Luxor, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

Bas-relief painted on the walls of the royal tomb, Setnakht tomb, Valley of the Kings, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

The Chapel of Our Lady of Vitaleta, Val D'Orcia, UNESCO World Heritage Site, Tuscany, Italy, Europe

Heian Buddhist temple, UNESCO World Heritage Site, Heiansa, Gayasan National Park, South Korea, Asia

Guardstones at Vatadage, Quadrangle, Polonnaruwa, UNESCO World Heritage Site, North Central Province, Sri Lanka, Asia

Rice terraces, Jatiluwih, UNESCO World Heritage Site, Bali, Indonesia, Southeast Asia, Asia

Our Lady of Carmo church in the Portuguese colonial town centre, UNESCO World Heritage Site, Ouro Preto, Minas Gerais, Brazil, South America

Pelourinho in city centre with Our Lady of the Roasary of Black People (Nossa Senhora do Rosario dos Pretos) at dusk, UNESCO World Heritage Site, Salvador de Bahhia, Bahia, Brazil, South America

Basilica of Bom Jesus, UNESCO World Heritage Site, Old Goa, Goa, India, Asia

Otter Point at sunset, Lake Malawi National Park, UNESCO World Heritage Site, Cape Maclear, Malawi, Africa

Dawn at the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia

Rio de Janeiro landscape showing Corcovado, the Christ and the Sugar Loaf, UNESCO World Heritage Site, Rio de Janeiro, Brazil, South America

Alhambra, UNESCO World Heritage Site, Granada, province of Granada, Andalucia, Spain, Europe

Chac Rain God masks, Nuns Quadrangle, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Columns Building in the foreground, and Pyramid of the Magician beyond, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Pyramid of the Magician on right, and Nun's Quadrangle to the left, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Palace of the Governor, Uxmal, Mayan archaeological site, UNESCO World Heritage Site, Yucatan, Mexico, North America

Sphinx in foreground, and the Great Pyramid of Cheops, The Giza Pyramids, UNESCO World Heritage Site, Giza, Egypt, North Africa, Africa

View from Prague Castle to the old town, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

Alpine memorial dwarfed by Mount Sefton, Aoraki (Mount Cook National Park, UNESCO World Heritage Site, Mackenzie district, Canterbury, South Island, New Zealand, Pacific

Blocks of ice float in one of the affluents of Lago Argentino, next to Perito Moreno Glacier, and wash ashore before they melt, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America.

Bayon Temple, Angkor, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Southeast Asia, Asia

St. Basil's Cathedral, UNESCO World Heritage Site, Moscow, Russia, Europe

Lenin's Tomb and the Kremlin Walls, Red Square, UNESCO World Heritage Site, Moscow, Russia, Europe

The columns of the Temple of Saturn and overview of the ruined Roman Forum, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Stunning Gardens of Villa Rufolo in spring, Ravello, Amalfi Coast, UNESCO World Heritage Site, Campania, Italy, Europe

Gorilla, Rushegura Group, (Gorilla gorilla beringei), Bwindi Impenetrable Forest National Park, UNESCO World Heritage Site, Buhoma, Uganda, Africa

The Lantern Bridge over the Thu Bon River in the historic centre, Hoi An, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Casa Mila (La Pedrera) (Open Quarry) at night, by Antoni Gaudi, UNESCO World Heritage Site, Paseo de Gracia Avenue, Barcelona, Catalonia, Spain, Europe

Grizzly Bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tents at Umbwe camp with view of Mount Meru, 4565m, Kilimanjaro National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Coyote (Canis latrans), Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

University of Potsdam building, Sanssouci Park, UNESCO World Heritage Site, Potsdam, Brandenburg, Germany, Europe

The painted ceiling in the gallery of Maps, Vatican Museum, UNESCO World Heritage Site, Vatican City, Rome, Lazio, Italy, Europe

Ceiling frescoes, St. Basil's Cathedral, Red Square, UNESCO World Heritage Site, Moscow, Russia, Europe

Overview, The Holy Trinity Saint Sergius Lavra, UNESCO World Heritage Site, Sergiev Posad, Russia, Europe

The Himalayan Queen toy train at Shimla railway station, terminus of the Kalka to Shimla Railway, UNESCO World Heritage Site, Shimla (Simla), Himachal Pradesh, India, Asia

The Monastery of Saint John the Theologian, The Main Church, frescoes in the dome, UNESCO World Heritage Site, Patmos, Dodecanese, Greek Islands, Greece, Europe

Interior of the Mosque-Cathedral (Great Mosque of Cordoba) (Mezquita), UNESCO World Heritage Site, Cordoba, Andalusia, Spain, Europe

Leaning Tower, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Surroundings, Pienza, Val d'Orcia, UNESCO World Heritage Site, Tuscany, Italy, Europe

Bryggen, UNESCO World Heritage Site, Bergen, Norway, Scandinavia, Europe

Arles Roman Ruins, Arles, UNESCO World Heritage Site, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Begijnhof (Beguinage), Order of St. Benedict Convent, UNESCO World Heritage Site, Bruges, Belgium, Europe

Mount Fitz Roy and Cerro Torre in winter conditions at sunrise reflected, Los Glaciares National Park, UNESCO World Heritage Site, El Chalten, Santa Cruz Province, Patagonia, Argentina, South America

Mount Fitz Roy at sunrise reflected in flowing river, Los Glaciares National Park, UNESCO World Heritage Site, El Chalten, Santa Cruz Province, Patagonia, Argentina, South America

Tranquil morning at Derwent Water in the Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Pulteney Bridge and the River Avon at night, Bath, UNESCO World Heritage Site, Somerset, England, United Kingdom, Europe

Castle of the Teutonic Order in Malbork, UNESCO World Heritage Site, Pomeranian Voivodeship, Poland, Europe

Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia

Standing stones in south east quadrant neolithic stone circle henge prehistoric monument, Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Neolithic stone circle and henge at Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe