Statue of a standing Xiezi, mythical Chinese Unicorn, on Spirit Way at the Ming Tombs site, Beijing, China

Dazu rock carvings of Buddha of Wisdom, Buddha of Great Sunlight, Buddha of Mercy, Mount Baoding, China

Dazu rock carvings at Mount Baoding, Chongqing, China

Bronze Han Dynasty cowrie container with yaks decorations, on display in the Shanghai Museum, China

Ancient Greek water reservoirs in the underground beneath Naples, Campania, Italy, Europe

Place de la Republique, Arles, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Dazu rock carvings of Buddha of Wisdom and Buddha of Great Sunlight at Mount Baoding, Chongqing, China

Tourists at Dazu rock carvings of Buddha of Mercy at Mount Baoding, Chongqing, China

Dazu rock carvings reliious scene at Mount Baoding, Chongqing, China

Western tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing, China

Amphorae, House of the Cryptoporticus, Roman ruins of Pompeii, UNESCO World Heritage Site, near Naples, Campania, Italy, Europe

Infantry men figures in Pit 1 at Qin Museum, exhibition halls of Terracotta Warriors, Xian, China

Infantry men figures in Pit 1 at Qin Museum, exhibition halls of Terracotta Warriors, Xian, China

Impluvium, with table and drum, House of (Casa di) Fabius Amandius, Roman Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

Arco di Costantino (Arch of Constantine), Rome, Lazio, Italy, Europe

Statue of a standing Qilin, Spirit Way, Ming Tombs, Beijing (Peking), China

Hu wine vessel on display in the Shanghai Museum, China

Statue of a resting lion, Spirit Way, Ming Tombs, Beijing (Peking), China

Ming vase on display in the Shanghai Museum, China

Ceramic Buddha figure on display in the Shanghai Museum, China

Pit 3 containing horses and warriors as they were found, at Qin Museum, exhibition halls of Terracotta Warriors, China

Buddha of Great Sunlight, the Chief Buddha, Dazu rock carvings, Mount Baoding, near Chongqing, China

Tourists at Dazu rock carvings of Buddha of Great Sunlight, Buddha of Mercy at Mount Baoding, China

Tourists at Odeon of Herodes Atticus Theatre, by the Acropolis, UNESCO World Heritage Site, Athens, Attica Region, Greece, Europe

Statue of a standing elephant, Spirit Way, Ming Tombs, Beijing (Peking), China

Roman temple of Diana, UNESCO World Heritage Site, Evora, Alentejo, Portugal, Europe

Arles Amphitheatre, Arles, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Place de la Republique, Arles, Bouches du Rhone, Provence, Provence-Alpes-Cote d'Azur, France, Europe

Buddha of Great Sunlight, the Chief Buddha, Dazu rock carvings, Mount Baoding, near Chongqing, China

Stone Buddha figure of Bodhisattva on display in the Shanghai Museum, China

Terracotta warriors and horses on display in the Shaanxi History Museum, Xian, China

Remains of the Roman amphitheatre discovered in the basement of the Guildhall, London, EC2, England, United Kingdom, Europe

Figurines on display in glass case in the Shaanxi History Museum, Xian, China

Tourists at Dazu rock carvings of Buddha of Great Sunlight, Buddha of Mercy at Mount Baoding, China

Ancient Chinese characters on display in the Shanghai Museum, China

Infantry men figures in Pit 1 at Qin Museum, exhibition halls of Terracotta Warriors, Xian, China

Statue of a stading camel, Spirit Way, Ming Tombs, Beijing (Peking), China

Dazu rock carvings at Mount Baoding, Chongqing, China

Camel figure on display in the Shaanxi History Museum, Xian, China

Public fountain on cobbled street, Roman ruins of Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

Acropolis Museum, Athens, Attica Region, Greece, Europe

Buddha stone from the Northern Qi Dynasty on display in the Shanghai Museum, China

Zhong Dynasty bell on display in the Shanghai Museum, China

Pantheon, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Infantry men figures in Pit 1 at Qin Museum, exhibition halls of Terracotta Warriors, Xian, China

Pan water vessel on display in glass case at the Shanghai Museum, China

Tourists photograph Terracotta warriors on display in the Shaanxi History Museum, Xian, China

Ara Pacis, Rome, Lazio, Italy, Europe

Public fountain on cobbled street, Roman ruins of Pompeii, UNESCO World Heritage Site, Campania, Italy, Europe

Teatro Marcello, Rome, Lazio, Italy, Europe

The tomb of Alasdair Macleod in St Clements Church in Rodel, Isle of Harris, Outer Hebrides, Scotland, UK, and ancient 15th century church built for the chiefs of the Clan Macleods

An old abandoned tin mine on moorland above St Agnes, Cornwall, UK.

An ancient medieval Tudor timber framed house in Dilwyn, Herefordshire, UK.

Ancient, medieval Tudor timber framed houses in Pembridge, Herefordshire, UK.

An ancient medieval Tudor timber framed house in Dilwyn, Herefordshire, UK.

An old abandoned tin mine on moorland above St Agnes, Cornwall, UK.

An old abandoned tin mine chimney on moorland above St Agnes, Cornwall, UK.

An old abandoned tin mine on moorland above St Agnes, Cornwall, UK.

An abandoned tin mine in Porthtowan on the North Cornish coast, UK.

The formal gardens of Lanhydrock a country residence dating from the 1600's in Cornwall, UK.

The formal gardens of Lanhydrock a country residence dating from the 1600's in Cornwall, UK.

Ancient preserved grave slabs in Iona Abbey on Iona, off Mull, Scotland, UK.

Sandstone pillars in Iona Abbey on Iona, off Mull, Scotland, UK.

An ancient preserved grave slab in Iona Abbey on Iona, off Mull, Scotland, UK.

Iona Abbey on Iona, off Mull, Scotland, UK.

Iona Abbey on Iona, off Mull, Scotland, UK, with the grave of John Smith, the former Labour leader in the foreground.

Ancient preserved grave slabs in Iona Abbey on Iona, off Mull, Scotland, UK.

An ancient preserved grave slab in Iona Abbey on Iona, off Mull, Scotland, UK.

St john's Cross in the grounds of Iona Abbey, Iona, off mull, Scotland, UK, with St Oran's Cross in the background

A solar park at Wheal Jane an old abandoned Cornish tin mine near Redruth, UK, that is rediscovering itself as a renewable energy hub.

A solar park at Wheal Jane an old abandoned Cornish tin mine near Redruth, UK, that is rediscovering itself as a renewable energy hub, with the old mine buildings in the background.

The formal gardens of Lanhydrock a country residence dating from the 1600's in Cornwall, UK.

St john's Cross in the grounds of Iona Abbey, Iona, off mull, Scotland, UK, with St Oran's Cross in the background

A granite Tor and standing stone on the summit of Great Links Tor, on Dartmoor, Devon, UK.

Castlerigg stone circle, near Keswick Lake District, UK.

Iona Abbey on iona, off Mull, Scotland, UK.

Castlerigg stone circle, near Keswick Lake District, UK.

Castlerigg stone circle, near Keswick Lake District, UK.

Sandstone pillars in Iona Abbey on Iona, off Mull, Scotland, UK.

Lanhydrock a country residence dating from the 1600's in Cornwall, UK.

The Purana Qila fort in Delhi; India at sunset.

4000 year old Standing stones on the Glen Gorm estate near Tobermory, Isle of Mull, Scotland, UK.

The Purana Qila fort in Delhi, India, the oldest building in delhi, dating back to the 16th Century

Roman mosaic floors at the Roman town of Conimbriga in Portugal

Roman mosaic floors at the Roman town of Conimbriga in Portugal, Europe

The rift valley at Pingvellir, Pingvellir National Park, UNESCO World Heritage Site, one of the most visited sites in Iceland, Polar Regions

La Calahorra Castle in La Calahorra at the foot of the Sierra Nevada mountains in Andalucia, Spain, Europe

Roman remains at the Roman town of Conimbriga in Portugal

The Merry Maidens stone circle near Lamorna Cove in Cornwall, England, United Kingdom, Europe

Crown Mine, an old abandoned tin mine on the Cornish coast at Botallack near St. Just, Cornwall, England, United Kingdom, Europe

The ancient Chysauster settlement near Penzance in Cornwall, the best preserved iron age settlement in the west country.

Dun Beag Broch on the Isle of Skye, Scotland, United Kingdom, Europe

The Merry Maidens stone circle near Lamorna Cove in Cornwall, England, United Kingdom, Europe

The University of Coimbra, Portugal, Europe

Dun Beag Broch on the Isle of Skye, Scotland, United Kingdom, Europe

An ancient stone cross in Crows an Wra in Cornwall, England, United Kingdom, Europe

Old tin mines on the Cornish coast at Botallack near St. Just, Cornwall, England, United Kingdom, Europe

Old wooden houses in Blatten above Zermatt, Switzerland, Europe

An ancient Broch near Stoer in Assynt, Sutherland, Scotland, United Kingdom, Europe

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.