Red footed booby (Sula sula) in red mangrove, Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Warbler finch (Certhidea olivacea), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos blue-footed booby (Sula nebouxii excisa), North Seymour Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos brown pelican (Pelecanus occidentalis urinator), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Waved albatross (Phoebastria irrorata ), Hispanola Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Lava gull (Leucophaeus fuliginosus), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos Lava Lizard (Microlophus albemarlensis), Hispanola Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus californianus wollebaeki), Galapagos, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula granti), Hispanola Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

A fresco in Aghios Andreas monastery showing founding fathers of Christianity, Mount Athos, UNESCO World Heritage Site, Greece

Strong walls of Ichon-Qala (Itchan Kala) Fortress, UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia

Kalyan Mosque with minaret, UNESCO World Heritage Site, Bukhara, Uzbekistan, Central Asia

Colonial architecture, Guanajuato, UNESCO World Heritage Site, Guanajuato State, Mexico, North America

Parish of the Immaculate Conception, Catholic pilgrimage site, Real de Catorce, San Luis Potosi state, Mexico, North America

Clock tower, Sighisoara, UNESCO World Heritage Site, Transylvania, Romania, Europe

Conca Mission, UNESCO World Heritage Site (designed by Franciscan Fray Junipero Serra), Arroyo Seco, Queretaro, Mexico

Itsukushima Shrine Torii Gate, UNESCO World Heritage Site, Miyajima Island, Hiroshima prefecture, Japan, Asia

Sher Dor Medressa at the Registan, UNESCO World Heritage Site, Samarkand, Uzbekistan, Central Asia

Interior of Tilla Kari Medressa at the Registan, UNESCO World Heritage Site, Samarkand, Uzbekistan, Central Asia

Traditional Canadian native Totem poles at Sunwapta Falls Resort, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Woman sitting on a donkey cart, Merv, UNESCO World Heritage Site, Turkmenistan, Central Asia, Asia

The Icefields Parkway road highway covered in ice at the Icefields Centre, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Moraine Lake in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Probota Monastery, UNESCO World Heritage Site, Dolhasca, Bucovina, Romania, Europe

Moraine Lake in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Early morning sunrise, Lake Louise, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Camels near Pyramid, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

Moraine Lake reflections in the Valley of the Ten Peaks, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Interior of Tilla Kari Medressa at the Registan, UNESCO World Heritage Site, Samarkand, Uzbekistan, Central Asia

Roofs, Sighisoara, UNESCO World Heritage Site, Transylvania, Romania, Europe

Waterfront pastel coloured houses, harbour at Porto Venere, Cinque Terre, UNESCO World Heritage Site, Liguria, Italy, Europe

Tepuis showing south side of Auyantepui (Auyantepuy) (Devil's Mountain) from Uruyen valley, Canaima National Park, UNESCO World Heritage Site, Venezuela, South America

Evening pujas at the Bridhadishwara Temple (Bridhadeeshwara Temple) (Great Chola Temple) in Thanjavur (Tanjore), UNESCO World Heritage Site, Tamil Nadu, India, Asia

Aerial image of Old Sarum, the original site of Salisbury with castle ruins and cathedral foundations inside two high Iron Age banks (earthworks), Wiltshire, England, United Kingdom, Europe

Aerial image of Chesil Beach (Chesil Bank), 29 km long shingle beach, a tombolo connecting mainland to the Isle of Portland, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Great Wall of China, UNESCO World Heritage Site, dating from the Ming Dynasty, Jinshanling, Luanping County, Hebei Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, dating from the Ming Dynasty, section looking towards Simatai, Jinshanling, Luanping County, Hebei Province, China, Asia

Gubeikou to Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, Miyun County, Beijing Municipality, China, Asia

Great Wall of China, UNESCO World Heritage Site, dating from the Ming Dynasty, section looking towards Simatai, Jinshanling, Luanping County, Hebei Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, dating from the Ming Dynasty, Jinshanling, Luanping County, Hebei Province, China, Asia

Gubeikou to Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, Miyun County, Beijing Municipality, China, Asia

The Nakul Sahdeva Ratha in the Five Rathas (Panch Rathas) complex at Mahabalipuram (Mamallapuram),UNESCO World Heritage Site, Tamil Nadu, India, Asia

Aerial image of Stonehenge, prehistoric monument and stone circle, UNESCO World Heritage Site, Salisbury Plain, Wiltshire, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Silbury Hill, a prehistoric human-made chalk and clay mound near Avebury, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Aerial image of Avebury, Neolithic Monument, site of a large henge and several stone circles, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Aerial image of Stonehenge, prehistoric monument and stone circle in snow, UNESCO World Heritage Site, Salisbury Plain, Wiltshire, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Stonehenge, prehistoric monument and stone circle, UNESCO World Heritage Site, Salisbury Plain, Wiltshire, England, United Kingdom, Europe

The stone Dharmaraja Ratha in the Five Rathas (Panch Rathas) complex at Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

The gopuram of the Bridhadishwara Temple (Bridhadeeshwara Temple) (Great Chola Temple), Thanjavur (Tanjore), UNESCO World Heritage Site,Tamil Nadu, India, Asia

Aerial image of the Royal Naval College and Queen's House, on the south bank of the River Thames, UNESCO World Heritage Site, with the Royal Observatory in the background, Greenwich, London, England, United Kingdom, Europe

A stone sculpture depicts a group of monkeys grooming close to Arjuna's Penance within the ancient site of Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

A colourful sunset over Durdle Door on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Detail from the Mahishasuramardini Cave, one of the rock-cut cave temples within the ancient site of Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

People enjoy an evening walk outside of the Red Fort (Lal Qila), built by Shah Jahan between 1638 and 1648, UNESCO World Heritage Site, Delhi, India, Asia

The famous bas relief panel of Arjuna's Penance (Bhagiratha's Penance) at Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

A man stands on a boat in the Sunderbans (Sundarbans) National Park, UNESCO World Heritage Site, West Bengal, India, Asia

Detail from a pillar of one of the mandapams (or mandapas), rock-cut cave temples within the ancient site of Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

Aerial image of the Houses of Parliament (Palace of Westminster) and Big Ben, UNESCO World Heritage Site, Westminster, London, England, United Kingdom, Europe

A Pacific green turtle, on the beach, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Aerial image of Stonehenge, prehistoric monument and stone circle, UNESCO World Heritage Site, Salisbury Plain, Wiltshire, England, United Kingdom, Europe

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Schoolgirls walk along a dyke on the edge of the Sunderbans (Sundarbans) National Park, UNESCO World Heritage Site, West Bengal, India, Asia

Indian tourists visit the Queen's Bath within the royal enclosure at Hampi, UNESCO World Heritage Site, Karnataka, India, Asia

The Mahanavami Dibba, the three-tiered structure within the royal enclosure at Hampi, UNESCO World Heritage Site, Karnataka, India, Asia

Pilgrims at the Bridhadishwara Temple (Bridhadeeshwara Temple) (Great Chola Temple), Thanjavur (Tanjore), UNESCO World Heritage Site,Tamil Nadu, India, Asia

The famous bas relief panel popularly known as Arjuna's Penance at Mahabalipuram (Mamallapuram), UNESCO World Heritage Site, Tamil Nadu, India, Asia

Aerial image of Lulworth Cove, a natural landform harbour, near West Lulworth, on the Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Aerial image of Chesil Beach (Chesil Bank), 29 km long shingle beach, a tombolo connecting mainland to the Isle of Portland, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Giant fruit of coco de mer palm (Lodoicea maldivica) in the Vallee de Mai Nature Reserve, UNESCO World Heritage Site, Baie Sainte Anne district, Island of Praslin, Seychelles, Africa

National Monument to Victor Emmanuel II and Roman Forum, UNESCO World Heritage Site, at dusk, Rome, Lazio, Italy, Europe

Birdwatcher beneath giant palm leaves in the Vallee de Mai Nature Reserve, UNESCO World Heritage Site, Baie Sainte Anne district, Island of Praslin, Seychelles, Africa

Adult Galapagos marine iguanas (Amblyrhynchus cristatus) basking on Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America r

Adult Galapagos marine iguanas (Amblyrhynchus cristatus) basking on Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America r

Jungle overgrowth at Ta Prohm Temple (Rajavihara), Angkor, UNESCO World Heritage Site, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

West gate at Ta Prohm Temple (Rajavihara), Angkor, UNESCO World Heritage Site, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

West gate at Ta Prohm Temple (Rajavihara), Angkor, UNESCO World Heritage Site, Siem Reap Province, Cambodia, Indochina, Southeast Asia, Asia

Fountain of Artemis in the middle of the roundabout at Archimedes Square (Piazza Archimede), Ortigia (Ortygia), Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Europe.

Teatro Greco (Greek Theatre), the Greek Amphitheatre at Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Europe

Syracuse Cathedral (Duomo di Siracusa) interior, Ortigia (Ortygia), Syracuse, UNESCO World Heritage Site, Sicily, Italy, Europe

Fountain of Artemis in Archimedes Square (Piazza Archimede) at night, Ortigia (Ortygia), Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Europe

Piazza Duomo at night, Syracuse Cathedral and Church of St. Lucia alla Badia, Ortigia (Ortygia), Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Europe

Mount Etna Volcano, shrine where the lava from an eruption stopped, UNESCO World Heritage Site, Sicily, Italy, Europe

Tourist taking a photo at Temple of Juno, Valley of the Temples (Valle dei Templi), Agrigento, UNESCO World Heritage Site, Sicily, Italy, Europe

Evening light on the busy square of Place Jemaa el-Fna with the minaret of the Koutoubia Mosque in the distance, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Traditional Moroccan Zallij tile work in the Ben Youssef Medersa, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Mount Lidgbird and Mount Gower at sunset, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific

Twilight in the Old Town, Lijiang, UNESCO World Heritage Site, Yunnan Province, China, Asia

Walls of China, a series of Lunettes in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

Aerial of Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific

Long shadows in the busy square of Place Jemaa el-Fna, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Courtyard and pool with traditional Moroccan ornate doorway in the Ben Youssef Medersa, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

The Minaret of the Koutoubia Mosque, illuminated at dusk with single palm tree, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Evening light on the busy square of Place Jemaa el-Fna with the minaret of the Koutoubia Mosque in the distance, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Evening light on the busy square of Place Jemaa el-Fna with the minaret of the Koutoubia Mosque in the distance, UNESCO World Heritage Site, Marrakech, Morocco, North Africa, Africa

Charles Ray's Boy with Frog statue on the tip of Zattere at sunrise, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

View of pier with Mount Lidgbird and Mount Gower in the background, Lord Howe Island, UNESCO World Heritage Site, Australia, Tasman Sea, Pacific

Early evening street scene in the Old Town, Lijiang, UNESCO World Heritage Site, Yunnan Province, China, Asia