An artificial hill for the elite
The Saint-Michel Tumulus is a massive, man-made mound of earth and stone, and it is the largest of its kind in continental Europe. Constructed around 4500 BCE, it predates the nearby stone rows and many other famous megalithic structures. Its dimensions are substantial: 125 meters in length, 60 meters in width, and rising to a height of 12 meters. The construction required an estimated 35,000 cubic meters of material, creating an artificial hill that dominates the Carnac area.
The structure's primary purpose was to house the tomb of one or more members of the Neolithic ruling class. Its immense scale and the valuable objects placed inside indicate the high status of the individuals interred within. The tumulus is a structure, built in several stages over a relatively short period during the 5th millennium BCE. Its core is made of rock, which is covered by a thick layer of greyish silt, and finally encased in a protective layer of stone. This construction has helped it endure for over six millennia.
A tomb of Alpine jade and complex chambers
The first modern excavations of the tumulus began in 1862, led by René Galles. By digging vertical pits from the summit, his team discovered a central burial chamber containing a number of prestigious artifacts. Among the finds were numerous polished axes made of jadeite, beads, and flint tools. Analysis of the jadeite axes revealed their origin to be the mountains of the Italian Alps, over 800 kilometers away, suggesting extensive trade networks or travel.
Further excavations between 1900 and 1907 by archaeologist Zacharie Le Rouzic revealed the monument's true layout. He uncovered a second dolmen and about fifteen smaller stone chests, or cists, arranged around the main tomb. The interior is a network of chambers and passages, though these are no longer accessible to the public for safety reasons.
A Christian chapel dedicated to Saint Michael was constructed on the summit, with the earliest version dating to 1664. The current building was rebuilt in 1926 after the previous one was destroyed. This layering of a Neolithic tomb with a Christian sanctuary shows the site's history across different cultures and eras. The majority of the artifacts recovered from the tumulus are now displayed at the Prehistory Museum of Carnac.