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 in 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. 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' (the others being Avebury, Durrington Walls and Mount Pleasant Henge".
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.
Windmill Hill is a Neolithic causewayed enclosure in the English county of Wiltshire, part of the Avebury World Heritage Site, about 1 mile (2 km) northwest of Avebury. Enclosing an area of 21 acres (8.5 ha), it is the largest known causewayed enclosure in Britain. The site was first occupied around 3800 BC, although the only evidence is a series of pits apparently dug by an agrarian society using Hembury pottery.
A bowl barrow is a type of burial mound or tumulus. A barrow is a mound of earth used to cover a tomb. The bowl barrow gets its name from its resemblance to an upturned bowl. Related terms include cairn circle, cairn ring, howe, kerb cairn, tump and rotunda grave.
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.
The Standing Stones of Stenness is a Neolithic monument five miles northeast of Stromness on the mainland of Orkney, Scotland. This may be the oldest henge site in the British Isles. Various traditions associated with the stones survived into the modern era and they form part of the Heart of Neolithic Orkney World Heritage Site. They are looked after by Historic Environment Scotland as a scheduled monument.
In archaeology, an enclosure is one of the most common types of archaeological site. It is any area of land separated from surrounding land by earthworks, walls or fencing. Such a simple feature is found all over the world and during almost all archaeological periods. They may be few metres across or be large enough to encompass whole cities.
In archaeology, a ring ditch is a trench of circular or penannular plan, cut into bedrock. They are usually identified through aerial photography either as soil marks or cropmarks. When excavated, ring ditches are usually found to be the ploughed‐out remains of a round barrow where the barrow mound has completely disappeared, leaving only the infilled former quarry ditch. Both Neolithic and Bronze Age ring ditches have been discovered.
Chanctonbury Ring is a prehistoric hill fort atop Chanctonbury Hill on the South Downs, on the border of the civil parishes of Washington and Wiston in the English county of West Sussex. A ridgeway, now part of the South Downs Way, runs along the hill. It forms part of an ensemble of associated historical features created over a span of more than 2,000 years, including round barrows dating from the Bronze Age to the Saxon periods and dykes dating from the Iron Age and Roman periods.
Figsbury Ring is an 11.2 hectare biological Site of Special Scientific Interest in Wiltshire, notified in 1975. It is owned and managed by the National Trust.
The Bull Ring is a Class II henge that was built in the late Neolithic period near Dove Holes in Derbyshire, England.
Della Grazie Battery, also known as Xgħajra Battery, is an artillery battery in Xgħajra, Malta. It was built by the British between 1888 and 1893. The battery stands above the shore to the east of Grand Harbour, between Fort Saint Rocco and Fort Saint Leonardo. It is currently in a dilapidated state, and part of the battery is used as the town hall for Xgħajra.
The Vallum is a huge earthwork associated with Hadrian's Wall in England. Unique on any Roman frontier, it runs practically from coast to coast to the south of the wall.
Milecastle 23 (Stanley) was a milecastle of the Roman Hadrian's Wall. Its remains exist as a low, grass covered platform with traces of an external ditch. It is located to the south of the B6318 Military Road around 1.5 kilometres (0.93 mi) west of its junction with the A68.
The Cursus Barrows is the name given to a Neolithic and Bronze Age round barrow cemetery located mostly south of the western end of the Stonehenge Cursus. The cemetery contains around 18 round barrows scattered along an east-to-west ridge, although some of the mounds are no longer visible. The Cursus Barrows can be seen just north of the route between the Stonehenge Visitor Centre and Stonehenge.
Portingbury Hills or Portingbury Rings is a hill in Hatfield Forest, Hatfield Broad Oak, Essex, suggested to date to the Iron Age or Bronze Age. It consists of a 3 features, a hill and mound connected by a zig-zag causeway formed by 2 almost parallel ditches to another rectangular enclosure measuring 30 by 21 metres surrounded by a large ditch with a suggested bank up to 11 metres wide. It is located in the northwest of Hatfield Forest in Beggarshall coppice. It has been considered to be an ancient defensive enclosure, but is too small to be a hill fort and is not in a defensible position.
Clearbury Ring is a univallate Iron Age hillfort which is partly in the parish of Downton in the county of Wiltshire in southwest England, approximately 5 kilometres (3 mi) due south of Salisbury city centre. The site, which is a Scheduled Ancient Monument, straddles the boundary with Odstock parish, and a slight scarp runs across the interior of the fort, marking the parish boundary.
Llwynda-Ddu Camp, also known as Llwynda-Ddu Hillfort, is a small iron age earthwork in Pentyrch, Cardiff in South Wales. The site is a scheduled monument, described as a prehistoric, defensive hillfort.
The Llanos de Moxos, also known as the Llanos de Mojos and the Beni Savanna, have extensive remains of pre-Columbian agricultural societies scattered over most of Beni Department, Bolivia. The remains testify to a well-organized and numerous indigenous people. This contradicts the traditional view of archaeologists, notably Betty Meggers, that the Amazon River Basin was not environmentally able to sustain a large population and that its indigenous inhabitants were hunter-gatherer bands or slash-and-burn farmers. In the 1960s, petroleum company geologists and geographer William Denevan were among the first to publicize the existence of extensive man-made earthworks in the Amazon, especially in the Llanos de Moxos.
Castle Goff is a hillfort about 1.5 miles (2.4 km) south-west of Camelford, in Cornwall, England.
