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 view of Castle Acre, remains of a motte and bailey castle with extensive earthworks, Castle Acre, Norfolk, England, United Kingdom, Europe

Aerial image of heart shape orchard, near Huish Hill earthwork, Oare, Wiltshire, England, United Kingdom, Europe

Aerial image of heart shape orchard, near Huish Hill earthwork, Oare, Wiltshire, England, United Kingdom, Europe

Abandoned ruin of Knowlton Church at dawn on a frosty winter morning, Dorset, England, United Kingdom, Europe

Standing stones of Neolithic henge, Stonehenge, UNESCO World Heritage Site, Wiltshire, England, United Kingdom, Europe

Silbury Hill, the largest man made mound in Europe dating from the Neolithic period, near Avebury, Wiltshire, England, United Kingdom, Europe

Aerial image of Wansdyke (from Woden's Dyke), an early medieval series of defensive linear earthworks, Tan Hill, Wiltshire, England, United Kingdom, Europe

Ring of Brodgar, Neolithic stone circle, UNESCO World Heritage Site, Mainland, Orkney Islands, Scotland, United Kingdom, Europe

Planting sugar-cane seed cuttings, Artemisa Province, Cuba, West Indies, Caribbean, Central America

High angle view of Maras salt marsh terraces, Salinas de Maras, Cuzco Region, Peru, South America

Aerial of Ouara, former capital of the Ouaddai Empire, Chad

Terrace cultivation on the heights of Machico, Madeira island, Atlantic Ocean, Portugal

Tilbury Fort moat, Tilbury, Essex, England, United Kingdom, Europe

The Kiva of the ancient Tusayan Ruins at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Abstract of terraces in Moray, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Aerial of Ouara, former capital of the Ouaddai Empire, Chad

Maiden Castle, near Dorchester, Dorset, England, United Kingdom, Europe

View from Hereford Beacon known as British Camp, site of ancient earthwork, Malvern Hills, Worcestershire, Midlands, England, United Kingdom, Europe

Brough Castle, dating back to the 11th century, believed to be the first stone built castle in England, and built within the earthworks of a Roman fort, Cumbria, England, United Kingdom, Europe

The keep, Brough Castle, dating back to the 11th century, believed to be the first stone built castle in England, and built within the earthworks of a Roman fort, Cumbria, England, United Kingdom, Europe

Brough Castle, dating back to the 11th century, believed to be the first stone built castle in England, built within the earthworks of a Roman fort, Cumbria, England, United Kingdom, Europe

Kisilverksmidja diatomaceous earthworks (diatomite, diahydro, kieselguhr) with Mt. Hliarfjall in the background, Myvatn, northern Iceland, Iceland, Atlantic Ocean

Crane doing earthworks, vineyard being newly constructed

Crane doing earthworks, vineyard being newly constructed