The Essential
Avenches occupies the site of the former Helvetian capital, Roman Aventicum founded by Augustus, which flourished in the 2C before being devastated in 259. The present little town, a former capitol, is far smaller than the ancient town whose unearthed remains (amphitheatre, theatre, sanctuary...) give some idea of its size.

Must see

Michelin's recommendations for Avenches

Avenches Roman Museum
Avenches Roman Museum
Housed in a wide medieval tower above