Tourism has been my passion and my profession since 1990. I began in La Plata, Argentina, at Euromar Turismo, the agency owned by my beloved father, Orazio Filippo Greco, before continuing in Italy with Andina Viaggi. Merlintravel grows from that experience and the desire to keep exploring and sharing the world. The journey continues…
Let’s see where it takes us.
Tourism has been my passion and my profession since 1990. I began in La Plata, Argentina, at Euromar Turismo, the agency owned by my beloved father, Orazio Filippo Greco, before continuing in Italy with Andina Viaggi. Merlintravel grows from that experience and the desire to keep exploring and sharing the world. The journey continues…
Let’s see where it takes us.
Illustrated guide · Aosta Valley
Sixteen chapters from a five-thousand-year-old ritual landscape to Augusta Praetoria, medieval Aosta and the Roman aqueduct bridge of Pont d’Aël.
Explore the placesA capital measured by its crossings
The city occupies the broadest part of a valley that narrows towards passages to France and Switzerland. Long before Rome, communities used this ground for settlement, cultivation, ritual and burial. The colony founded in 25 BCE then turned the same geography into a controlled urban and military hinge.
Later centuries did not erase that plan. Churches entered Roman districts, towers reused the walls, civic streets crossed the ancient grid and the modern regional capital continued to face the same rivers and slopes.
This guide follows those layers on foot, then extends west to Pont d’Aël, where Roman engineering makes the relationship between water, agriculture and the road towards the Little Saint Bernard visible in one structure.
One destination
Aosta stands near the meeting of the Dora Baltea and the Buthier, below routes leading towards the Great and Little Saint Bernard passes. The natural basin offered cultivable land and movement across the Alps, but also required constant negotiation with water, slopes and winter.
The historic centre preserves an unusually legible sequence: the rectangular logic of Augusta Praetoria, early Christian buildings, Ottonian frescoes, Romanesque sculpture, medieval towers and a nineteenth-century civic square. Seeing it well means comparing alignments and reuse, not collecting isolated monuments.
The selection
The route begins with the basin before Rome, enters the planned colony, follows its Christian and medieval reuse and ends at Pont d’Aël on the western road system.
Rivers, terraces and routes before a formal city
The basin was already a worked and meaningful landscape when Rome imposed an urban grid upon it.
From the edges of the historic centre, the enclosing slopes and the confluence of the Dora Baltea and Buthier remain legible. Modern roads and buildings obscure parts of the ancient terrain, but the width of the basin still explains why settlement concentrated here.
Prehistoric and protohistoric evidence documents long use of the conca for agriculture, ritual, burial and movement. The Salassi controlled Alpine routes and resources before Roman conquest; they should be understood as communities with their own territorial systems, not simply as a preface to the colony.
Ritual ploughing, timber alignments, stelae and tombs
The western quarter preserves a ceremonial and funerary sequence beginning near the end of the Neolithic.
The MegaMuseo descends visitors to the archaeological level and controls light around the preserved structures. Stele, post alignments, ritual furrows and funerary monuments are read through excavation phases rather than presented as one frozen moment.
The site was discovered during building work in 1969 and subsequently acquired and excavated by the regional administration. Its layers continue through the Copper and Bronze Ages into Roman agricultural and funerary use, showing that the western suburb of Augusta Praetoria inherited much older ground.
A veteran colony planned at the Alpine crossroads
The Roman rectangle organised defence, traffic, public life and private building after the conquest of 25 BCE.
The ancient plan is best reconstructed by walking between gates, wall fragments and streets rather than from one viewpoint. Later lanes sometimes preserve Roman alignments, while other sectors were altered by churches, palaces and modern traffic.
Augusta Praetoria was founded for Praetorian veterans after Roman victory over the Salassi. Cardo and decumanus divided the walled area into insulae; forum, theatre, amphitheatre and infrastructure turned the colony into the administrative centre of a territory tied to the Gallic roads.
A ceremonial entrance beside a river that later moved
The eastern approach joins military commemoration to the changing course of the Buthier.
The Arch of Augustus stands in a busy urban space east of Porta Praetoria. Nearby, the Roman bridge now crosses dry ground because the Buthier changed course, making the gap between ancient infrastructure and present hydrology unusually clear.
The honorific arch commemorated Augustus and the conquest in the foundation year of the colony. The bridge carried the road across the Buthier towards the gate; later Christian devotion, restoration and urban growth changed how both monuments were used and perceived.
The principal eastern gate preserved inside the city
Parallel gate façades and multiple passages reveal how movement was filtered through the Roman wall.
The gate is entered directly from the pedestrian centre, where Roman stone, conservation work and later buildings meet at close range. Its vehicle opening and flanking pedestrian passages remain visible between the outer and inner faces.
Porta Praetoria connected the decumanus to the road from Eporedia and was the colony’s most monumental gate. Medieval structures occupied and reused the defensive complex; modern restoration recovered its scale while necessarily selecting among later additions.
A Roman perimeter absorbed by medieval power
The wall survived because houses, towers and institutions repeatedly occupied it.
Fragments appear along streets, courtyards and towers such as the Tour du Bailliage and Tourneuve. Some stretches are freestanding; others can only be understood through changes in masonry or the alignment of later buildings.
The Roman curtain and towers defined the colony, then became convenient foundations for medieval residences and defence. Feudal and civic authorities appropriated strategic corners, while demolition and restoration opened selected portions in the modern city.
Public spectacle in the north-eastern quarter
One monumental wall dominates the skyline while the neighbouring amphitheatre survives inside later religious property.
The theatre site preserves the high southern façade, cavea remains and archaeological ground framed by Alpine peaks. The amphitheatre is less immediately visible because medieval construction incorporated it, making access and interpretation different from the open theatre.
Both entertainment buildings belonged to the planned colony and were linked by a portico serving spectators. Their later dismantling supplied material and land for new uses; the theatre’s surviving wall became the emblematic fragment of Roman Aosta.
A terraced civic and sacred centre below the cathedral quarter
The underground gallery reveals how Roman builders managed slope while enclosing the forum’s sacred terrace.
Visitors enter a cool, low-lit double gallery below the modern cathedral area. Above ground, the forum is difficult to imagine as a whole, so the surviving cryptoporticus, temple traces and city plan must be read together.
The forum stood near the crossing of cardo and decumanus. A raised sacred area with twin temples was bordered by the cryptoporticus, while the lower platea accommodated civic, administrative and commercial functions on terrain that naturally descended southward.
Domestic and working spaces beyond the monuments
Archaeological windows recover parts of the blocks where urban life continued between public buildings.
The Giardino dei Ragazzi preserves portions of insulae within a modern recreational area, while the Consolata villa and other excavations broaden the picture. These remains are low and fragmentary, requiring plans and careful attention to thresholds, drains and walls.
The colony’s orthogonal streets created building plots for houses, workshops and services. Rebuilding across Roman centuries altered room divisions and circulation; later construction buried much of this evidence without completely destroying the ancient grid.
Objects returning scale and chronology to the ruins
The MAR connects material from across the valley to the urban sites visible outside.
Collections present prehistoric, Salassi, Roman and medieval evidence, including inscriptions, sculpture, funerary objects and domestic material. The museum is part of the regional archaeological ticket system, but displays and access arrangements should be checked before a visit.
Regional collecting and excavation assembled evidence that cannot remain in situ or needs controlled conservation. Museum interpretation has shifted from isolated antiquities towards archaeological contexts, allowing the colony to be understood within a much longer valley history.
Burials and sacred building outside the Roman gate
The excavated basilica shows Christian institutions taking shape in the late Roman suburb.
Below the church of San Lorenzo, a protected archaeological route reveals foundations, tombs and liturgical organisation. Its scale is quieter than the Roman monuments but essential for understanding the shift from civic colony to episcopal city.
A funerary basilica developed in late antiquity near the eastern necropolis, associated with privileged burials and the cult of local saints. Rebuilding above preserved and transformed the sacred focus through medieval and modern centuries.
A medieval complex built beside the eastern Roman quarter
Church, crypt, bell tower, cloister and priory record several moments of Alpine religious culture.
The complex is approached across a broad square east of the Roman gate. The church and cloister have different visiting conditions; guided access may be required for the attic frescoes and priory spaces.
Major rebuilding around the eleventh and twelfth centuries produced an important Romanesque ensemble. Darkened marble capitals in the cloister carry biblical, moral and fantastic imagery, while concealed Ottonian frescoes link Aosta to artistic networks across the Alps.
Episcopal power, Ottonian art and later façades
The cathedral quarter places Christian architecture directly over the civic and sacred centre of Augusta Praetoria.
The present façade, twin towers, interior, cloister and treasury belong to different periods. Roman remains below and around the precinct are not continuously visible, so the vertical sequence is understood through the cryptoporticus and museum interpretation.
An early Christian complex developed within the former Roman city and was transformed substantially around the year 1000. Ottonian frescoes survive in the roof space; Gothic, Renaissance and later campaigns altered chapels, cloister, decoration and façade without erasing the medieval core.
Private power inserted into Roman geometry
Aosta’s medieval city is visible in towers and residences that occupied strategic Roman lines.
Maison Lostan, the Tour du Bailliage, Tourneuve, Bramafam and other structures are dispersed through the centre. Some have institutional uses or limited interiors, so their urban position often matters more than entering every building.
Bishops, lords, Savoy officers and urban families divided authority across the medieval city. Towers rose against gates and walls, residences absorbed ancient masonry and later administrations reshaped them, producing a network rather than a single castle-dominated centre.
Civic space, memory and autonomy beyond ancient Aosta
The nineteenth-century square and later institutions show that the city did not end with its monuments.
The pedestrian piazza centres on the Hôtel de Ville and opens into the commercial streets of modern Aosta. Its name commemorates Émile Chanoux, connecting the public space to resistance, federalist thought and the region’s autonomous identity.
Urban redevelopment replaced the former Franciscan convent with a neoclassical civic complex and square. Twentieth-century conflict, liberation and the Special Statute made Aosta the political centre of an autonomous, officially bilingual region.
Roman water engineering above the Grand Eyvia gorge
The bridge carried water and a protected passage across a side valley west of Aosta.
At Pont d’Aël near Aymavilles, the high masonry structure spans a wooded ravine. Access reveals the difference between the upper hydraulic channel and the covered pedestrian corridor; height, narrow interiors and seasonal conditions require attention.
An inscription dates the work to 3 BCE and associates it with Caius Avillius Caimus. The aqueduct served agricultural or industrial activity on the opposite slope, demonstrating private investment and technical control of water along the wider corridor towards the western Alps.
The Alpine city through time
The chronology connects the ritual landscape, Roman colony, Christian city, medieval institutions and modern regional capital.
Ritual ploughing, timber alignments and anthropomorphic stelae mark the developing megalithic area at Saint-Martin-de-Corléans.
Rome defeats the Salassi and founds Augusta Praetoria for veterans at the meeting of Alpine roads.
The dated Pont d’Aël aqueduct bridge demonstrates ambitious water engineering west of the colony.
Forum, theatre, amphitheatre, houses and infrastructure express the mature Roman city.
Early Christian funerary and episcopal complexes reorganise sacred space within and outside the Roman walls.
The cathedral and Sant’Orso develop major Ottonian and Romanesque programmes, including frescoes and the cloister.
Towers, residences and religious institutions occupy and transform the inherited Roman grid.
Post-Napoleonic political restoration and civic rebuilding reshape the town within the Savoy state.
Resistance memory and the Special Statute frame the modern autonomous region with Aosta as its capital.
Discovery, excavation and museum construction at Saint-Martin-de-Corléans expand the city’s public history beyond Rome.
Before your visit
Allow a full day for Roman and medieval Aosta and a separate excursion to Pont d’Aël. The MegaMuseo alone deserves unhurried time.
Regional archaeology tickets, opening hours and guided-access spaces can change. Confirm the current arrangement with the official heritage service.
The historic centre is compact and best read on foot. Pont d’Aël is outside Aosta and requires a separate transfer and attention to terrain.
Use plans and museum models to understand lost structures, but keep them distinct from the fragmentary walls and foundations visible today.
Method and sources
The guide was written from the regional archaeological service, official cultural-heritage pages and the regional tourism authority. Dates and interpretations are attributed conservatively; modern opening hours, tickets, restoration works and access rules are not treated as permanent facts.
The images are documentary watercolours, not photographs or complete reconstructions. Archaeological sites, church interiors and Pont d’Aël have variable access conditions; consult the linked official pages shortly before visiting.
