Aosta, also known as the "Rome of the Alps", was founded by the Romans in 25 BC with the name Augusta Praetoria.

Valle d’Aosta is well-known for its medieval castles. The most famous are Fènis Castle, Issogne manor-house , Verres Castle, Sarre Castle, Saint-Pierre Castle and Bard Fortress.

Built in 3 AD. by Roman colonies, Aimus and Avilius, over the gorge of the Grand Eyvia river, the aqueduct bridge in Pondel stone, about 56 meters high and over 50 meters long, is one of the most interesting monuments of the Roman Period in the Aosta Valley, still perfectly preserved.