A megalith is a large stone which has been used to construct a structure or monument, either alone or together with other stones. Megalithic means structures made of such large stones, utilizing an interlocking system without the use of mortar or cement.
The word 'megalith' comes from the Ancient Greek 'megas' meaning great, and 'lithos' meaning stone. Megalith also denotes an item consisting of rock(s) hewn in definite shapes for special purposes. It has been used to describe buildings built by people from many parts of the world living in many different periods. A variety of large stones are seen as megaliths, with the most widely known megaliths not being sepulchral. The construction of these structures took place mainly in the Neolithic (though earlier Mesolithic examples are known) and continued into the Chalcolithic and Bronze Age.

At a number of sites in eastern Turkey, large ceremonial complexes from the 9th millennium BC have been discovered. They belong to the incipient phases of agriculture and animal husbandry, from which the European (or Western) Neolithic would later develop. Large circular structures involving carved megalithic orthostats are a typical feature, eg. at Nevali Cori and Göbekli Tepe. Although these structures are the most ancient megalithic structures known so far, it is not clear that any of the European Megalithic traditions (see below) are actually derived from them. At Göbekli Tepe four stone circles have been excavated from an estimated 20. Some measure up to 30 metres across. The stones carry carved reliefs of boars, foxes, lions, birds, snakes and scorpions.

The most common type of megalithic construction in Europe is the dolmen - a chamber consisting of upright stones (orthostats) with one or more large flat capstones forming a roof. Many of these, though by no means all, contain human remains, but it is debatable whether use as burial sites was their primary function. Though generally known as dolmens, many local names exist, such as anta in Portugal, stazzone in Sardinia, hunebed in the Netherlands, Hünengrab in Germany, dysse in Denmark, and cromlech in Wales. It is assumed that most dolmens were originally covered by earthen mounds.
The second most common tomb type is the passage grave. It normally consists of a square, circular or cruciform chamber with a slabbed or corbelled roof, accessed by a long, straight passageway, with the whole structure covered by a circular mound of earth. Sometimes it is also surrounded by an external stone kerb. Prominent examples include the sites of Bru na Boinne and Carrowmore in Ireland, Maes Howe in Orkney, and Gavrinis in France.
The third tomb type is a diverse group known as gallery graves. These are axially arranged chambers placed under elongated mounds. The Irish court tombs, British long barrows and German Steinkisten belong to this group. Another type of megalithic monument is the single standing stone, or menhir. Some of these are thought to have an astronomical function as a marker or foresight, and in some areas long and complex alignments of such stones exist for example at Carnac in Brittany.
In parts of Britain and Ireland the best-known type of megalithic construction is the stone circle, of which there are hundreds of examples, including Stonehenge, Avebury, Ring of Brodgar and Beltany. These too display evidence of astronomical alignments, both solar and lunar. Stonehenge, for example, is famous for its solstice alignment. Examples of stone circles are also found in the rest of Europe. They are normally assumed to be of later date than the tombs, straddling the Neolithic and the Bronze Age.

Megalithic tombs are aboveground burial chambers, built of large stone slabs (megaliths) laid on edge and covered with earth or other, smaller stones. They are a type of chamber tomb, and the term is used to describe the structures built across Atlantic Europe, the Mediterranean and neighbouring regions, mostly during the Neolithic period, by Neolithic farming communities. They differ from the contemporary long barrows through their structural use of stone.
There is a huge variety of megalithic tombs. The free-standing single chamber dolmens and portal dolmens found in Brittany, Denmark, Germany, Ireland, Netherlands, Sweden, Wales and elsewhere consist of a large flat stone supported by three, four or more standing stones. They were covered by a stone cairn or earth barrow. Examples with outer areas, not used for burial, are also known.
The Court Cairns of south west Scotland and northern Ireland, the Severn-Cotswold tombs of south west England and the Transepted gallery graves of the Loire region in France share many internal features although the links between them are not yet fully understood. That they often have antechambers or forecourts is thought to imply a desire on the part of the builders to emphasise a special ritual or physical separation of the dead from the living. The Passage graves of Orkney, Ireland's Boyne Valley, and north Wales are even more complex and impressive, with cross shaped arrangements of chambers and passages. The workmanship on the stone blocks at Maeshowe for example is unknown elsewhere in north west Europe at the time.
Megalithic tombs appear to have been used by communities for the long-term deposition of the remains of their dead and some seem to have undergone alteration and enlargement. The organisation and effort required to erect these large stones mean that the societies concerned must have placed great emphasis on the proper treatment of their dead. The ritual significance of the tombs is supported by the presence of megalithic art carved into the stones at some sites. Hearths and deposits of pottery and animal bone found by archaeologists around some tombs also implies some form of burial feast or sacrificial rites took place there.
Further examples of megalithic tombs include the stalled cairn at Midhowe in Orkney and the passage grave at Bryn Celli Ddu on Anglesey. Despite its name, the Stone Tomb in Ukraine was not a tomb but rather a sanctuary.

Associated with the megalithic constructions across Europe there are often large earthworks of various designs ditches and banks, broad terraces, circular enclosures known as henges, and frequently artificial mounds such as Silbury Hill in England and Monte dıAccoddi in Sardinia. Sometimes, as at Glastonbury Tor in England, it is suggested that a natural hill has been artificially sculpted to form a maze or spiral pattern in the turf. Spirals were evidently an important motif for the megalith builders, and have been found carved into megalithic structures all over Europe - along with other symbols such as lozenges, eye-patterns, zigzags in various configurations, and cup and ring marks. Whilst clearly not a written script in the modern sense of the term, these symbols are considered to have conveyed meaning to their creators, and are remarkably consistent across the whole of Western Europe.

In Western Europe and the Mediterranean, megaliths are generally constructions erected during the Neolithic or late stone age and Chalcolithic or Copper Age (4500-1500 BC). Perhaps the most famous megalithic structure is Stonehenge in England, although many others are known throughout the world.
The French Comte de Caylus was the first to describe the Carnac stones. Legrand d'Aussy introduced the terms menhir and dolmen, both taken from the Breton language, into antiquarian terminology. He interpreted megaliths as gallic tombs.
In Britain, the antiquarians Aubrey and Stukeley conducted early research into megaliths. In 1805, Jacques Cambry published a book called Monuments celtiques, ou recherches sur le culte des Pierres, precedees d'une notice sur les Celtes et sur les Druides, et suivies d'Etymologie celtiques, where he proposed a Celtic stone cult. This completely unfounded connection between druids and megaliths has haunted the public imagination ever since.
In Belgium there is a megalithic site at Wéris, a little town situated in the Ardennes. In the Netherlands, megalithic structures can be found in the north-east of the current, mostly in the province of Drenthe. Knowth is a passage grave of the Bru na Boinne neolithic complex in Ireland, dating from c.3500-3000 BC. It contains more than a third of the total number of examples of megalithic art in all Western Europe, with over 200 decorated stones found during excavations.
Timeline of megalithic construction - Mesolithic - Neolithic - Chalcolithic - Bronze Age Wikipedia
African Megaliths Wikipedia
Middle Eastern Megaliths Wikipedia
Asian Megaliths Wikipedia
Analysis and Evaluation Wikipedia
Types of Megalithic Structures Wikipedia

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