The view to the southeast from Point Sublime after sunset, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Arched doorway, Fatehpur Sikri, UNESCO World Heritage Site, Uttar Pradesh state, India, Asia

Taj Mahal, UNESCO World Heritage Site, seen through gateway, Agra, Uttar Pradesh state, India, Asia

Gothic detail on the facade of the Duomo (Cathedral), including the sun symbol, Siena, UNESCO World Heritage Site, Tuscany, Italy, Europe

Halia, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Panoramic view over the city, Siena, UNESCO World Heritage Site, Tuscany, Italy, Europe

The Great Mosque, the largest mud built mosque in the World, Djenne, Mali, Africa

Inca terraces and ruins, Machu Picchu, UNESCO World Heritage Site, Peru, South America

Statue of Amun, with Ramses II (Ramasses the Great) between his knees, Karnak, UNESCO World Heritage Site, Thebes, Egypt, North Africa, Africa

Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia

Painting in Cave 17, one of the world-heritage Buddhist caves at Ajanta, carved from a gorge in the Waghore River, Maharashtra State, India

The huge Kailasa (Kailash) Temple, Ellora, Maharashtra State, India"Cut from the rock in the Hindu section of the world-heritage cave temples at Ellora, a project which took 150 years and entailed the removal of 200,000 tons of rock"

Close up of one of the world's rarest birds, Aldabra rail, last flightless bird of the Indian Ocean, Dryolinnas cuvieri aldabranus

View along the Grand Canal towards Santa Maria Della Salute from Academia Bridge, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Santa Maria Della Salute, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Carnival model in red cape and gold mask peering from columns in St. Mark's Square, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

The Duomo (Cathedral), Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Gondolas, S. Marco Canal, island and church of S. Giorgio Maggiore, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Sorrento, Costiera Amalfitana (Amalfi Coast), UNESCO World Heritage Site, Campania, Italy, Europe

Villa Cimbrone, Ravello, Costiera Amalfitana (Amalfi Coast), UNESCO World Heritage Site, Campania, Italy, Europe

Boats and waterfront, Positano, Costiera Amalfitana (Amalfi Coast), UNESCO World Heritage Site, Campania, Italy, Europe

Villa Rufolo, Ravello, Costiera Amalfitana (Amalfi Coast), UNESCO World Heritage Site, Campania, Italy, Europe

Naiad fountain, Schonbrunn, UNESCO World Heritage Site, Vienna, Austria, Europe

The Great Mosque, the largest dried earth building in the world, a UNESCO World Heritage site, Djenne, Mali, Africa

Restored buildings in Roman town buried in AD 79 by ash flows from Mount Vesuvius, in the background, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

The Duomo (Cathedral), Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Casa di Fauna, ruins of Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Duomo (Cathedral), Florence, UNESCO World Heritage Site, Tuscany, Italy, Europe

Ruins of Pompeii, destroyed in volcanic eruption of AD 79, Pompeii, UNESCO World Heritage site, Campania, Italy, Europe

Lake Louise, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

The Pyramids, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

Gastown Steam Clock, the world's first steam powered clock built by Raymond Saunders, Gastown, Vancouver, British Columbia, Canada

Temple of Ramesses III (Rameses III), Valley of the Kings, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

Buddhist monks at the Bayon temple, Angkor, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Asia

Buddhist monks at Angkor Wat, Angkor, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Asia

Novice Buddhist monk and Phra Atchana Buddha statue, Wat Si Chum, Sukhothai, UNESCO World Heritage Site, Sukhothai Province, Thailand, Asia

Novice Buddhist monk kneeling beneath the Phra Atchana Buddha statue, Wat Si Chum, Sukhothai, UNESCO World Heritage Site, Sukhothai Province, Thailand, Asia

Novice monks and Phra Atchana Buddha statue, Wat Si Chum, Sukhothai, UNESCO World Heritage Site, Sukhothai Province, Thailand, Asia

Ivan Franco Opera and Ballet Theatre, Old Town, Lviv, UNESCO World Heritage Site, Ukraine, Europe

Cone-shaped trulli houses, in the Rione Monte district of Alberobello, UNESCO World Heritage Site, in Apulia, Italy, Europe

Old Town, UNESCO World Heritage Site, Tallinn, Estonia, Baltic States, Europe

Large carved seated statues of the pharaoh, Temple of Rameses II (Ramasses II) (Ramses the Great), Abu Simbel, UNESCO World Heritage Site, Nubia, Egypt, North Africa, Africa

Monument in front of St. Sava Orthodox church dating from 1935, the biggest Orthodox church in the world, Belgrade, Serbia, Europe

View from Pyramid of the Moon of the Avenue of the Dead and the Pyramid of the Sun in background, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Colonial architecture, Old City, UNESCO World Heritage Site, Cartagena, Bolivar Department, Colombia, South America

Carcassonne, UNESCO World Heritage Site, Aude, Languedoc-Roussillon, France, Europe

West front, Reims Cathedral, UNESCO World Heritage Site, Champagne, France, Europe

The Parthenon and Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Camel riders at Giza Pyramids, UNESCO World Heritage Site, Giza, Cairo, Egypt, North Africa, Africa

Northern Acropolis, Tikal, UNESCO World Heritage Site, Guatemala, Central America

Buddhist stupa, Taxila, UNESCO World Heritage Site, Punjab, Pakistan, Asia

View from Pyramid of the Moon of the Avenue of the Dead and the Pyramid of the Sun in background, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Columns depicting the Quetzal Bird, Palace of the Quetzal Butterfly, Teotihuacan, 150AD to 600AD and later used by the Aztecs, UNESCO World Heritage Site, north of Mexico City, Mexico, North America

Statues of seated, standing and sleeping Buddha, Isurumuniya, Anuradhapura, UNESCO World Heritage Site, Sri Lanka, Asia

Monks in the Ta Prohm Temple, Angkor, UNESCO World Heritage Site, Siem Reap, Cambodia, Indochina, Asia

Chateau, Versailles, UNESCO World Heritage Site, Ile-de-France, France, Europe

The Parthenon at sunset, UNESCO World Heritage Site, Athens, Greece, Europe

Chateau de Chambord, UNESCO World Heritage Site, Centre, France, Europe

The Dome of the Rock, Temple Mount, Old City, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

The archaeological site and Arab castle, Palmyra, UNESCO World Heritage Site, Syria, Middle East

The Parthenon, UNESCO World Heritage Site, Athens, Greece, Europe

Hiker on Tongariro Crossing trek by Blue Lake under winter ice and snow, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific

Ancient carved heads of gods on summit of Mount Nemrut, Nemrut Dagi (Nemrut Dag), UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Ancient carved heads of gods on summit of Mount Nemrut, Nemrut Dagi (Nemrut Dag), UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Panoramic view of Aya Sophia Mosque (Haghia Sofia) (St. Sophia) at dusk, UNESCO World Heritage Site, Istanbul, Turkey, Europe

Panoramic view of Aya Sophia Mosque (Haghia Sofia) (St. Sophia) at dawn, UNESCO World Heritage Site, Istanbul, Turkey, Europe

Ancient carved stone heads, Nemrut Dagi (Nemrut Dag), on summit of Mount Nemrut, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Panoramic view, soft focus effect, across lagoon towards island of San Giorgio Maggiore, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

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

Caernarfon (Caernarvon) Castle, UNESCO World Heritage Site, Gwynedd, North Wales, UK, Europe

Conwy (Conway) Castle, UNESCO World Heritage Site, Gwynedd, North Wales, UK, Europe

Pulteney Bridge over the River Avon and weir, Bath, UNESCO World Heritage Site, Avon, England, UK, Europe

Chateau de Chambord, Loire Valley, UNESCO World Heritage Site, France, Europe

Sully-sur-Loire chateau, Loire Valley, UNESCO World Heritage Site, France, Europe

Caernarfon (Caernarvon) Castle, UNESCO World Heritage Site, Gwynedd, North Wales, Wales, UK, Europe

Gunlom Falls, Kakadu National Park, UNESCO World Heritage Site, Australia, Pacific

Houses of Parliament (Palace of Westminster), UNESCO World Heritage Site, Westminster Bridge and River Thames, London, England, UK, Europe

Azay le Rideau chateau, Loire Valley, UNESCO World Heritage Site, Centre, France, Europe

Houses of Parliament at dusk, UNESCO World Heritage Site, Westminster, London, England, United Kingdom (U.K.), Europe

Stairway, Persepolis, UNESCO World Heritage Site, Iran, Middle East

Detail of the Parthenon, Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

The Mayan rain god Chac, holding burning torch showing his power to withhold or dispense rain, in west court of the Mayan ruins at Copan, UNESCO World Heritage Site, western highlands, Honduras, Central America

Mont Saint-Michel (Mont-St. Michel) at sunset, UNESCO World Heritage Site, La Manche region, Basse Normandie (Normandy), France, Europe

Late winter hikers on snowfield in South Crater on Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, South Auckland, North Island, New Zealand, Pacific

Detail of Old Town Clock on Town Hall at Old Town Square, Stare Mesto, Prague, UNESCO World Heritage Site, Czech Republic, Europe

View from the Castle (El Castillo), Mayan pyramid, to Temple of the Warriors and jungle in distance, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, Central America

Arches, the Red Fort, Agra, UNESCO World Heritage Site, Uttar Pradesh state, India, Asia

Cliff Geyser erupts from geyserite bank on edge of Firehole River through Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Detail of ornate design on arches in the Patio de las Doncellas (Patio of the Maidens), Palacio de Don Pedro, Alcazar Palace, UNESCO World Heritage Site, Sevilla (Seville), Andalucia (Andalusia), Spain, Europe

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

Al-Aqsa Mosque on Temple Mount with Archaeological Park and Mount of Olives, Jerusalem, UNESCO World Heritage Site, Israel, Middle East

Two novice Buddhist monks in front of a statue of the reclining Budha, Wat Lokayasutharam, Ayuthaya Historical Park, Ayuthaya (Ayutthaya), UNESCO World Heritage Site, central Thailand, Thailand, Southeast Asia, Asia

Two novice Buddhist monks with offerings, and Buddha head, Wat Phra Mahathat, Ayuthaya Historical Park, Ayuthaya (Ayutthaya), UNESCO World Heritage Site, central Thailand, Thailand, Southeast Asia, Asia

Traditional Cambodian apsara dancer, temples of Angkor Wat, UNESCO World Heritage Site, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

Novice monk with offering of flowers, and Buddha head in Wat Phra Mahathat, Ayuthaya (Ayutthaya) Historical Park, Ayuthaya (Ayutthaya), UNESCO World Heritage Site, central Thailand, Thailand, Southeast Asia, Asia

View at dusk along Grand Canal towards Santa Maria Della Salute from Accademia Bridge, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Facade of the Treasury (El Kazneh), Nabatean archaeological site, Petra, UNESCO World Heritage Site, Jordan, Middle East

Tower of Belem, built 1515-1521, UNESCO World Heritage Site, and Rio Tejo (River Tagus), Lisbon, Portugal, Europe

Silhouette of the temple of Angkor Wat reflected in the lake, UNESCO World Heritage Site, Angkor, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

Mont Saint Michel (Mont-St. Michel), UNESCO World Heritage Site, Manche, Normandie (Normandy), France, Europe