Roman origin, busy medieval market, a transit point for everyone who passed the Alps, the city lies in a wide, sunny valley between terraced vineyards, almost half of the long valley of Baltea. The point is that Aosta has been inhabited since prehistoric times, but its birth as a cultural center and city traffic came with the Romans.
The Roman city has left an eye-catching, not only in the major monuments such as the Arch of Augustus and the Roman theater, but in the regular arrangement of the streets, that has not been altered in later times, and in which the grafted austere fortified houses of feudal lords or the great churches of medieval spirituality, such as the Cathedral and the church of S. Orso. Every year, in January, Aosta revives the old tradition of the medieval fair of St. Orso, for centuries the most important craft market in the region, now enriched with cultural and folklore events.