Augusta Praetoria Salassorum (Aosta) was founded by Rome in 25 BC after defeating the Salassi, a Celtic Alpine tribe. The Roman city survives almost complete: the Arco d'Augusto (triumphal arch, 25 BC), the Porta Praetoria (double-arched city gate with the original Roman road visible), the Theater (the facade stands to full height), the Amphitheater (now partially enclosed within a convent), the Forum cryptoporticus (underground arcade), and the street grid (cardo and decumanus still define the modern streets). All this at 583 meters altitude, in a valley flanked by 4,000m peaks. The Collegiata di Sant'Orso (Romanesque cloister with 40 carved capitals — some of the finest Romanesque sculpture in the Alps) and the Cathedral (two mosaic floors visible through glass panels) add medieval layers to the Roman base. From Aosta: Mont Blanc (Courmayeur 35min), the Matterhorn (Cervinia 50min), Gran Paradiso National Park (30min). Valle d'Aosta →
Plan my Valle d'Aosta trip →Arco d'Augusto (25 BC): A triumphal arch celebrating the Roman victory over the Salassi — standing alone east of the old town, framing the mountains behind. Porta Praetoria: The massive double city gate — walk through the same arches Roman legionaries used. Roman Theater: The facade (22m high) stands to its original height — the most impressive surviving Roman theater facade in northern Italy. €7 combo (all Roman sites). Cryptoporticus: An underground arcade beneath the Forum — walk through 2,000-year-old vaulted corridors. Collegiata di Sant'Orso: The Romanesque cloister (12th century) — 40 carved capitals depicting biblical scenes, monsters, and plant motifs. Free. Cathedral: Two medieval mosaic floors (10th-12th century, visible through glass panels in the nave), a carved Gothic choir, and a treasury with gold reliquaries. €3 treasury.
Getting there: Aosta station (Turin-Aosta line, 2h from Turin). By car: 1.5h from Turin via A5. Stay: €55-100/night. Eat: Vecchio Ristoro (€35-50 — carbonade valdostana, fontina fonduta, polenta concia), Osteria da Nando (€25-35). Fontina cheese: Valle d'Aosta's DOP cheese — buy at the Cooperativa Produttori Latte e Fontina. Combine with: Courmayeur/Mont Blanc (35min — SkyWay Monte Bianco cable car, €50 return — the most spectacular cable car in the Alps), Cervinia/Matterhorn (50min), Gran Paradiso (30min — the oldest national park in Italy), Fénis Castle (15min — the most photographed castle in the Valle).