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The Carnac Stones, Brittany, France. Source: guitou60 / Adobe Stock

Unraveling the Mystery of the Carnac Stones: An Ancient Puzzle of Epic Proportions

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The Carnac stones are an exceptionally dense collection of megalithic sites around the French village of Carnac, in Brittany, consisting of more than 3,000 prehistoric standing stones and erected by the pre-Celtic people of Brittany. These megalithic wonders are the largest such collection on the planet, however their purpose has never been discovered.

A Patterned Landscape

The Carnac Stones consist of both single standing stones (menhirs) and multi-stone clusters (dolmens) arranged in rows and patterns across the landscape. The main group of stone alignments involves 12 converging rows of standing stones stretching more than a kilometer with the remains of a stone circle at either end. The largest stones, around 4m high, are at the western end and they become smaller along the length of the alignment reaching around 0.6m in height.

It is thought that the stones were erected during the Neolithic period which lasted from 4500 BC until 2000 BC. In reality, archaeologists have had great difficulty in establishing accurate dates as little material was found beneath them that could be used for radiocarbon dating.

The Purpose of the Carnac Stones

Local myth states that a Roman legion was on the march when the wizard Merlin turned them into stone. Archaeologically speaking, the original purpose of the Carnac stones remains a mystery, and there are many theories but no definitive answers.

Some archaeologists believe that the stones served a ritual or religious purpose, possibly as part of a burial site, or a site for fertility rites. Others suggest that the stones were used for marking property boundaries, detecting earthquakes, honoring ancestors, commemorating significant events in the lives of the pre-Celtic people who erected them, or simply a symbol of the power and prestige of the people who built them.

The Carnac stones were arranged in rows. Source: Karl Allen Lugmayer / Adobe Stock

The Carnac stones were arranged in rows. Source: Karl Allen Lugmayer / Adobe Stock

Astronomical Observation

One of the most popular theories, is that the Carnac stones functioned as an ancient astronomical observatory. The stone formations may have acted as calendars, so that ancient farmers knew the seasons and when to plant and harvest their crops and the priests could foretell phenomena such as eclipses of the sun and moon. 

Some of the Carnac stones are aligned with the sun and the moon. The most famous of these alignments is the "Grand Menhir Brisé," a broken menhir that stands over 20 feet tall and is believed to be the largest standing stone ever erected by humans. The Grand Menhir Brisé was aligned with the setting sun during the winter solstice, which suggests that it may have been used to mark the changing seasons.

Grand Menhir Brisé, the largest stone at Carnac. Source: shorty25 / Adobe Stock

Grand Menhir Brisé, the largest stone at Carnac. Source: shorty25 / Adobe Stock

Other stones in the Carnac complex are aligned with the moon and stars, indicating that the pre-Celtic people who built them may have had a sophisticated understanding of astronomy. However, because the pre-Celtic people who constructed the Carnac stones left no written records, the true purpose of these remarkable megaliths remains a subject of ongoing research and speculation.

Top image: The Carnac Stones, Brittany, France. Source: guitou60 / Adobe Stock

By Joanna Gillan



Pete Wagner's picture

Almost certainly pre-Ice Age, and possibly glacier-eroded, but they may have originally served as fence-posts of sorts, to pen in big domesticated animals.

Nobody gets paid to tell the truth.

The name of one stone, Grand Menhir Brisé, sums up the story of this site. A mixture of French and Breton, it is a case of later folk trying to describe what was already there. Centuries later still, are we really that much closer to understanding it all?

Thts as far as they had to move them so they could soil. But how much shade do they make?

I think every one over thinking this. The stones were erected to catch the heat of the sun during the day and release I at night to keep the crops from freezing. The simple answer is usually the right one. if you look closely they are not aligned in anyway

I am very interested in ancient cultures and the possibility of alien beings as part of our history.


Joanna Gillan's picture


Joanna Gillan is a Co-Owner, Editor and Writer of Ancient Origins. 

Joanna completed a Bachelor of Science (Psychology) degree in Australia and published research in the field of Educational Psychology. She has a rich and varied career, ranging from teaching... Read More

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