A cairn is a human-made pile (or stack) of stones raised for a purpose, usually as a marker or as a burial mound. The word cairn comes from the Irish: carn [ˈkʰaːrˠn̪ˠ] (plural cairn [ˈkʰaːrˠɲ]).
Cairns have been and are used for a broad variety of purposes. In prehistory, they were raised as markers, as memorials and as burial monuments (some of which contained chambers).
A chamber tomb is a tomb for burial used in many different cultures. In the case of individual burials, the chamber is thought to signify a higher status for the interred than a simple grave. Built from rock or sometimes wood, the chambers could also serve as places for storage of the dead from one family or social group and were often used over long periods for multiple burials.
Most chamber tombs were constructed from large stones or megaliths and covered by cairns, barrows or earth. Some chamber tombs are rock-cut monuments or wooden-chambered tombs covered with earth barrows. Grave goods are a common characteristic of chamber tomb burials.
A tumulus (pl.: tumuli) is a mound of earth and stones raised over a grave or graves. Tumuli are also known as barrows, burial mounds, mounds, howes, or in Siberia and Central Asia as kurgans, and may be found throughout much of the world. A cairn, which is a mound of stones built for various purposes, may also originally have been a tumulus.
Tumuli are often categorised according to their external apparent shape. In this respect, a long barrow is a long tumulus, usually constructed on top of several burials, such as passage graves. A round barrow is a round tumulus, also commonly constructed on top of burials. The internal structure and architecture of both long and round barrows have a broad range; the categorization only refers to the external apparent shape.
A passage grave or passage tomb consists of one or more burial chambers covered in earth or stone and having a narrow access passage made of large stones. These structures usually date from the Neolithic Age and are found largely in Western Europe. When covered in earth, a passage grave is a type of burial mound which is found in various forms all over the world. When a passage grave is covered in stone, it is a type of cairn.
Miosgán Meadhbha, anglicized Miosgan Meva and also called Maeve's Cairn, is a large cairn on the summit of Knocknarea in County Sligo, Ireland. It is thought to conceal a passage tomb from the Neolithic (New Stone Age). It is the largest cairn in Ireland, excepting those at Brú na Bóinne in Meath.
The cairn is about 55 metres (180 ft) wide and 10 metres (33 ft) high. The cairn is flat-topped and several kerbstones can be seen on the northern side. It is believed to date to around 3000 BCE. Archaeologist Stefan Bergh, in his book Landscape of the Monuments (1995), suggests that a large hollow some way to the west of the cairn was the quarry from which the stones were taken.
Knocknarea (/nɒknəˈreɪ/; Irish: Cnoc na Riabh) is a large prominent hill west of Sligo town in County Sligo, Ireland, with a height of 327 metres (1,073 ft). Knocknarea is visually striking as it has steep limestone cliffs and stands on the Coolera Peninsula overlooking the Atlantic coast. At the summit is one of Ireland's largest cairns, known as Queen Maeve's Cairn, which is believed to contain a Neolithic passage tomb. In recent years there has been concern that the ancient cairn, a protected National Monument, is being damaged by climbers. There are also remains of several smaller tombs on the summit. Knocknarea overlooks the Carrowmore tombs and is thought to have been part of an ancient ritual landscape (see Bricklieve Mountains).
A chambered cairn is a burial monument, usually constructed during the Neolithic, consisting of a sizeable (usually stone) chamber around and over which a cairn of stones was constructed. Some chambered cairns are also passage-graves. They are found throughout Britain and Ireland, with the largest number in Scotland.
Typically, the chamber is larger than a cist, and will contain a larger number of interments, which are either excarnated bones or inhumations (cremations). Most were situated near a settlement, and served as that community's "graveyard".