In addition to its status as a World Heritage Site by Unesco since 1986, it is one of the most outstanding and mysterious prehistoric sites in the world. Since the 18th century it has been associated with the druids, the followers of a spiritual tradition of Celtic origin, supposedly being built by them as a temple, although to this day there is still no clear evidence about it. In fact, its true use is unknown with certainty, although the countless investigations carried out to date can largely intuit what this impressive site was and what it was used for.

The structure that Stonehenge draws is made up of large blocks of rocks of different natures distributed in four concentric circles. The outer circle, 30 meters in diameter, is made up of large rectangular sandstone stones, originally surmounted by lintels of the same material and of which only seven remain in their original site. Inside the first circle of stones is another smaller one made of bluish sandstone. Within it, a horseshoe-shaped structure, also made of blue sandstone, encloses a slab of micaceous sandstone known as the Altar. Surprisingly, the construction follows the so-called golden ratio, also existing in other types of constructions made between the Neolithic and the Bronze Age.

With an age of at least 5,000 years, what is known is that the placement of each of its stones, whose weight is several tons each, had to be the result of a millimeter measurement, or at least carried out by people with great notions of astronomy that included the movements of the Sun. In fact, it is considered that it could be an astronomical observatory, probably to precede the seasons according to the location of the Sun since the monument is completely aligned with it both on the summer solstice as at the twilight of the winter solstice.

On the other hand, the various findings and measurements carried out throughout the 20th century confirm different construction phases of the monument. Based on radiocarbon dating of the rocks in each of the concentric circles, a difference of approximately 1000 years can be determined between the outer and inner circles, also suggesting that their use may have evolved over the centuries and been refined until the configuration that has remained to this day. The presence of burials with cremation remains and related material findings, as well as a 3 km long processional path, reinforce and at the same time generate uncertainty about the use or uses that it may have had for at least 1,500 years.

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