Stonehenge, whose name means is a large megalithic monument consists of a set of concentric circular structures, built between -2800 and -1100, from the Neolithic to the Bronze Age. It is located eight miles north of Salisbury, and four kilometers west of Amesbury (Wiltshire, England).
The entire site of Stonehenge and Avebury stone circle, about forty miles north, are listed on the World Heritage List of UNESCO in a set entitled “Stonehenge, Avebury and Associated Sites.” Today, the site attracts nearly a million visitors per year
Dating and understanding the various phases of activity at Stonehenge is not an easy task. Generations of archaeologists have succeeded on the site since the early twentieth century: Professor Gowland led the first scientific excavations in 1901, then Colonel William Hawley began restorations from 1919 before studying most existing cavities, until 1926. The chronology used in this article is the conventional one, the archaeologist Richard J. C. Atkinson, who led the recent large-scale excavations, from 1950 and during thirty years, with a major restoration campaign between 1958 and 1964. He was responsible for the division into three phases I, II and III, are now accepted by all. But subdivisions, and sometimes the whole chronology, significantly differ from a modern author to another.