Located right in the heart of the region, Aosta is its only city and administrative centre. It lies in a huge valley where the two rivers, the Doire Baltée and the Buthier, meet. The area has always played an important role in commercial trade and was thus the reason why the Romans conquered it. Visible traces of their time here still exist. The Arco d'Augusto (August Arch), the Porta Praetoria (Praetorian Gates), and the Criptoportico Forense (a part of the forum) are visits not to be missed. A place of passage due to the Little and Great Saint Bernard mountain passes, Aosta has managed to maintain its uniqueness and traditions, which have elsewhere been lost. Traditional activities like woodworking and wool weaving on ancient weaving looms are still practised in this city.