Aosta is a city founded by the Romans in 25 BC name of Augusta Praetoria. The colony was built near the confluence of the river Buthier with Dora, is an exemplary model of urban planning. Because of the importance of the Roman remains can still be seen, Aosta was called the Rome of the Alps the Roman city Aosta preserves important monuments such as the Arch of Augustus, the Porta Pretoria, the theater that after years of delicate restoration work, the monumental southern facade is again visible in all its grandeur, less than 22 m high, the forensic cryptoporticus, the walls almost entirely preserved. The urban rigidly orthogonal, which divided the city into insulae, is still recognizable in the urban present.