There are three related types of Neolithic earthwork that are all sometimes loosely called henges. The essential characteristic of all three is that they feature a ring-shaped bank and ditch, with the ditch inside the bank. Because the internal ditches would have served defensive purposes poorly, henges are not considered to have been defensive constructions. The three henge types are as follows, with the figure in brackets being the approximate diameter of the central flat area:
- Henge (> 20 m). The word henge refers to a particular type of earthwork of the Neolithic period, typically consisting of a roughly circular or oval-shaped bank with an internal ditch surrounding a central flat area of more than 20 m (66 ft) in diameter. There is typically little if any evidence of occupation in a henge, although they may contain ritual structures such as stone circles, timber circles and coves. Henge monument is sometimes used as a synonym for henge. Henges sometimes, but by no means always, featured stone or timber circles, and circle henge is sometimes used to describe these structures. The three largest stone circles in Britain are each within a henge. Examples of henges without significant internal monuments are the three henges of Thornborough Henges. Although having given its name to the word henge, Stonehenge is atypical in that the ditch is outside the main earthwork bank.
- Hengiform monument (5 – 20 m). Like an ordinary henge, except the central flat area is between 5 and 20 m (16–66 ft) in diameter, they comprise a modest earthwork with a fairly wide outer bank. The terms Mini henge or Dorchester henge are sometimes used as synonyms for hengiform monument. An example is the Neolithic site at Wormy Hillock Henge.
- Henge enclosure (> 300 m). A Neolithic ring earthwork with the ditch inside the bank, with the central flat area having abundant evidence of occupation and usually being more than 300 m (980 ft) in diameter. Some true henges are as large as this, but lack evidence of domestic occupation. Super henge is sometimes used as a synonym for a henge enclosure. However, sometimes Super henge is used to indicate size alone rather than use, e.g. "Marden henge ... is the least understood of the four British 'superhenges' ".
A causewayed enclosure is a type of large prehistoric earthwork common to the early Neolithic in Europe. More than 100 examples are recorded in France and 70 in England, while further sites are known in Scandinavia, Belgium, Germany, Italy, Ireland and Slovakia.
Hambledon Hill is a prehistoric hill fort in Dorset, England, situated in the Blackmore Vale five miles northwest of Blandford Forum. The hill itself is a chalk outcrop, on the southwestern corner of Cranborne Chase, separated from the Dorset Downs by the River Stour. It is owned by the National Trust.
Mounds State Park is a state park near Anderson, Madison County, Indiana featuring Native American heritage, and ten ceremonial mounds built by the prehistoric Adena culture indigenous peoples of eastern North America, and also used centuries later by Hopewell culture inhabitants. It is separate from the similarly named Mounds State Recreation Area.
Yarnbury Castle is the site of a multiphase, multivallate Iron Age hillfort near the village of Steeple Langford, Wiltshire, England. The site covers an area of 28.5 acres (11.5 ha), and was extensively surveyed and investigated by the Royal Commission on the Historical Monuments of England in 1991, with finds of Iron Age and Romano-British pottery, Iron Age and Roman coins, and burials of human remains. There is much evidence of prolonged and extensive settlement of the site, including evidence of around 130 structures of various sizes, most probably representing a mix of round houses, pits, and other features.
Biggleswade Castle was a castle in the market town of Biggleswade in Bedfordshire.
Tempsford is a village and civil parish in the Central Bedfordshire district of the county of Bedfordshire, England, about 7 miles (11 km) east north-east of the county town of Bedford.
Priddy Circles are a linear arrangement of four circular earthwork enclosures near the village of Priddy on the Mendip Hills in Somerset, England. The circles have been listed as Scheduled Ancient Monuments, and described as 'probable Neolithic ritual or ceremonial monuments similar to a henge'.
In archaeology, earthworks are artificial changes in land level, typically made from piles of artificially placed or sculpted rocks and soil. Earthworks can themselves be archaeological features, or they can show features beneath the surface.
The Newark Earthworks in Newark and Heath, Ohio, consist of three sections of preserved earthworks: the Great Circle Earthworks, the Octagon Earthworks, and the Wright Earthworks. This complex, built by the Hopewell culture between 100 BCE and 400 CE, contains the largest earthen enclosures in the world, and was about 3,000 acres in total extent. Less than 10 percent of the total site has been preserved since European-American settlement; this area contains a total of 206 acres (83 ha). Newark's Octagon and Great Circle Earthworks are managed by the Ohio History Connection. A designated National Historic Landmark, in 2006 the Newark Earthworks was also designated as the "official prehistoric monument of the State of Ohio."
While there are many castles in South Yorkshire, the majority are manor houses and motte-and-bailey which were commonly found in England after the Norman Conquest.
Ladle Hill is a 10.5-hectare (26-acre) biological Site of Special Scientific Interest west of Kingsclere in Hampshire. It is also a Scheduled Monument.
Scratchbury Camp is the site of an Iron Age univallate hillfort on Scratchbury Hill, overlooking the Wylye valley about 1km northeast of the village of Norton Bavant in Wiltshire, England. The fort covers an area of 37 acres (15 ha) and occupies the summit of the hill on the edge of Salisbury Plain, with its four-sided shape largely following the natural contours of the hill.
Colliers Hatch, is a hamlet in the civil parish of Stapleford Tawney in the Epping Forest district of the county of Essex, England. It is approximately 2 miles (3 km) east of Epping, 3.5 miles (6 km) west of Chipping Ongar and 7 miles (11 km) north of Romford. Colliers Hatch is 0.5 miles (0.8 km) north of the hamlet of Tawney Common, also in the Stapleford Tawney parish.
Whitehawk Camp is the remains of a causewayed enclosure, on Whitehawk Hill in Brighton and Hove, East Sussex, England. Causewayed enclosures are a form of Neolithic earthwork which began to appear in England from about 3700 BC onwards, characterized by the full or partial enclosure of an area with ditches that are interrupted by gaps, or causeways. It is not known what they were used for; they may have been settlements, or meeting places, or ritual sites of some kind. The site consists of four roughly concentric circular ditches, with banks of earth along the interior of the ditches evident in some places. There may have been a timber palisade along the banks. There are at least two ditches tangent to the outermost circuit, one of which is thought from radiocarbon evidence to date to the second millennium BC, about two thousand years after the earliest dated activity at the site.
The Marietta Earthworks is an archaeological site located at the confluence of the Muskingum and Ohio Rivers in Washington County, Ohio, United States. Most of this Hopewellian complex of earthworks is now covered by the modern city of Marietta. Archaeologists have dated the ceremonial site's construction to approximately 100 BCE to 500 CE.
Knap Hill lies on the northern rim of the Vale of Pewsey, in northern Wiltshire, England, about a mile north of the village of Alton Priors. At the top of the hill is a causewayed enclosure, a form of Neolithic earthwork which began to appear in England from about 3700 BC onwards, characterized by the full or partial enclosure of an area with ditches that are interrupted by gaps, or causeways. It is not known what they were used for; they may have been settlements, or meeting places, or ritual sites of some kind. The site has been scheduled as an ancient monument.
Bigo, also Bigo bya Mugenyi, is an extensive alignment of ditches and berms comprising ancient earthworks located in the interlacustrine region of southwestern Uganda. Situated on the southern shore of the Katonga River, Bigo is best described as having two elements. The first consists of a long, irregular ditch and bank alignment with multiple openings that effectively creates an outer boundary by connecting to the Kotanga River in the east and the Kakinga swamp to the west. Toward its eastern end the outer ditch branches further to the east to encompass a nearby crossing of the Katonga River. The second element consists of a central, interconnected group of four irregularly shaped ditch and bank enclosures that are connected to the Katonga River by a single ditch. Three mounds are associated with the central enclosures; two within and one immediately to the west. When combined, the Bigo earthworks extend for more than 10 kilometers. Resulting from radiometric dates collected from archaeological investigations conducted in 1960 and additional investigations undertaken at the Mansa earthworks site in 1988, 1994, and 1995, the Bigo earthworks have been dated to roughly AD 1300-1500, and have been called Uganda's "largest and most important ancient monument."
The Shriver Circle Earthworks are an Ohio Hopewell culture archaeological site located in Chillicothe in Ross County, Ohio. At 1,200 feet (370 m) in diameter the site is one of the largest Hopewell circular enclosures in the state of Ohio.
Whimpton Village is a deserted medieval village in Nottinghamshire, England. It is near the A57 road between the villages of Darlton and Dunham-on-Trent. It is a Scheduled Monument.
