A megalith is a large stone that has been used to construct a structure or monument, either alone or together with other stones. The word "megalithic" describes 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 "μέγας" (megas) meaning "great" and "λίθος" (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. Large circular structures involving carved megalithic orthostats are a typical feature, e.g. 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.
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