In 1969, in the Aosta district of Saint-Martin-de-Corléans, a contractor was digging the foundations of a block of flats. About six metres below street level the workmen struck something that was not soil: a prehistoric sanctuary covering roughly ten thousand square metres, in use for more than six thousand years.
The museum built over it opened on 24 June 2016, and to my mind it is the best reason to come to Aosta. Not because it is finer than the Roman theatre, but because it is the one thing you do not expect in a city everybody describes as Roman.
Warning: it closes on Mondays, and it is the only archaeological site in Aosta that does. And the last entry is ninety minutes before closing, not thirty as elsewhere: after 16:30 you will not get in. Two small details that ruin the day of anyone who does not know them.
How you find a sanctuary: by accident, while digging
The discovery was accidental, and that explains the museum’s odd shape. It was not built where it would have been convenient: it was built over the hole, in the middle of a 1960s residential district, and from outside it presents itself as a long wall faced in green stone with the site’s name cut into it all in lower case.
Warning about a figure that circulates in two versions. The ten thousand square metres are the excavated archaeological area; the twelve thousand you will read elsewhere are the floor area of the museum built over it. No source is wrong: they are two measurements of two different things.
It was Franco Mezzena, the archaeologist who directed the excavation, who first used the phrase «megalithic area» to describe the Aosta find. It is not a standard technical term: it indicates a piece of ground on which monumental megalithic remains of different kinds occur together, so not only stelae or only tombs but all of it at once. Which is exactly the case here.
Six metres below the street, six thousand years of use
What do you see as you go down? Not an ancient building but a piece of ground. The route runs on walkways suspended above the excavated surface, and that surface is the document.
Four kinds of trace can be read on it together: regular plough furrows, cylindrical ritual wells, post holes set in oriented alignments, and the pits of the tombs. The wooden posts have been gone for millennia, but the holes they stood in remain, and their arrangement shows the alignment was not accidental.
Use begins in the Late Neolithic, continues into the Eneolithic, or Copper Age, and then runs through the Bronze and Iron Ages, the Roman period, the Middle Ages and modern times. Under those flats, in short, people came back to do things for six thousand years without a break.
The anthropomorphic stelae, the people made of stone
What you will remember are the anthropomorphic stelae: slabs of stone as tall as a person, shaped and decorated, driven upright into the ground.
Look at them closely. The decoration runs in rows of triangles, incised and set in overlapping bands that alternate light and dark like a woven cloth, and lower down there are bands with lozenge motifs. This is not abstract ornament: scholars read it as clothing, as the rendering of a decorated garment, and other stelae carry elements standing for weapons and jewellery. They are human figures rendered by attribute rather than by feature, and the face is almost absent.
The regional tourist portal counts forty-six of them, and that is the figure in circulation. I give it to you attributed because other sources write «more than forty-six»: it is a floor, not a closed inventory, and on a site that yielded stelae reused inside the tombs the difference between the two formulas is not pedantry.
The ploughed field, a rite performed with a plough
Of all the traces, the one that struck me hardest is the least spectacular: the plough furrows.
In the oldest layer you can read rows of regular, crossing furrows made by a drawn plough. These were not fields anything was harvested from: they were ritual ploughings, gestures repeated over time inside a sacred area, tied to farming cults and to cults of the living. Somebody, five thousand years ago, came into this space and ploughed it because ploughing was the rite.
Think about that for a moment and the usual image of prehistory turns over. Not a people of hunters in front of a dolmen, but a community of farmers using the tool of their daily work as a liturgical instrument. It is the kind of fact only an excavation can give, because a furrow in the ground is not a museum object: it survives only if nobody touches it.
From sanctuary to necropolis, and the stelae reused as stone
Then something changes. In the last centuries of the third millennium BC the area gradually stops being an open-air sanctuary and becomes a privileged necropolis, with monumental tombs of various kinds, among them dolmen and cist burials.
And here is the detail that is worth the journey. Some of those tombs were built by reusing the stelae: the slabs carved by their predecessors, driven upright as figures, were pulled out and employed as building material for the graves. The people of stone became wall.
Around 2200 BC, at the start of the Bronze Age and for reasons still unclear, the site loses its cultic function as well and keeps only the funerary one. In the late Bronze Age it goes back to being farmland, and stays that way for more than a thousand years.
Sion, or the proof that this valley was never isolated
Why a sanctuary of this scale precisely here? The answer lies across the border. The Aosta site has direct parallels with the Petit-Chasseur at Sion, in the Swiss Valais, where a complex of anthropomorphic stelae and megalithic tombs of the same period and the same cultural family has been excavated.
Between Aosta and Sion stand the Alps, and in between them the Great St Bernard pass. The conclusion is that the pass was already in use thousands of years before the Romans built their road over it, and that the Aosta Valley, which we picture as a closed valley floor, was a corridor. The same position that in 25 BC persuaded Augustus to found Augusta Praetoria here already counted in the third millennium BC.
The legend of Cordela, and why I am not telling it as fact
A pleasant and convenient story circulates in Aosta Valley antiquarian tradition: the area is supposed to have served for the ritual burials of the city of Cordela, founded by Cordelus, legendary ancestor of the Salassi, which stood on higher ground than the site.
It is an explanation that closes everything neatly, and for that reason it has been repeated for centuries. The trouble is that it cannot be verified: no sources support it, and nobody has ever found Cordela. I pass it on because you will hear it mentioned and because it belongs to the cultural history of the place, not because it happened.
What archaeologists do think likely, and it is less romantic but more interesting, is that the sacred and funerary function of the area implies an important settlement close by, perhaps to the north-west. That settlement has not yet been located. There is a village five thousand years old, somewhere under Aosta, that nobody has found.
Practical information
Details checked on 7 September 2026 on the Aosta Valley Region tourist portal. Prices and opening times change: check again before you travel.
Tickets. The unguided visit costs 7 euros and the reduced rate is 5 euros, for groups of at least twenty-five paying visitors and for agreed partners. The guided visit costs 12 euros, reduced to 8. There is a family rate of 25 euros for two adults with two or three children. The site is included in the single «Aosta Archeologica» ticket at 10 euros, valid for six months, which also covers the Roman theatre, the forum cryptoporticus, the church of San Lorenzo and the Regional Archaeological Museum: if you expect to see at least one more site, that one is better value.
Opening times. Open Tuesday to Sunday, 10:00-18:00. Closed on Mondays and on 25 December. Warning: the last entry is ninety minutes before closing, so at 16:30, and that rule differs from the one at the other archaeological sites in Aosta, where you can go in until thirty minutes before.
Free admission. Entry is free under 18, for people with certified disabilities and for teachers accompanying school groups.
Getting there. The museum stands in via San Martino de Corléans, about a kilometre and a half west of the old centre: twenty minutes on foot from the arch of Augustus, or a city bus. There is parking nearby if you drive.
Accessibility. The route is accessible to wheelchairs, and tactile experiences and three-dimensional models are available for visitors with impaired sight. It is one of the best equipped archaeological sites in Italy on this front.
How long it takes. An hour and a half for the unguided visit, a good two hours with a guide. If you hold the combined ticket and want to see the centre on the same day, put this first: closing at 18:00 with last entry at 16:30, it is the stop most likely to be dropped.
The rest of Aosta
This museum is the stop worth putting in the morning, and how the rest of the day arranges itself around it is in what to see in Aosta in one day. The other pieces in the cluster are the Roman theatre and the walls of Augusta Praetoria, the collegiate church of Sant’Orso with the cloister and the forty capitals, the cathedral with the choir mosaics and the treasure museum and the arch of Augustus with the stone bridge.
If you are drawn to civilisations that left no written texts and that we know only through objects, the other great Italian case is Nuragic Sardinia: I wrote about it in the guide to Cagliari in two days, where the bronzes in the archaeological museum do for the late Bronze Age what the stelae do here.
Photo credits: museum exterior by Patafisik and Elena Tartaglione (CC BY-SA 4.0), anthropomorphic stelae by Stefano Merli (CC BY-SA 2.0). All from Wikimedia Commons.
