Padova
We went to Padova by train. Parking a car is almost impossible for a visitor and Italian cities have not yet heard of the concept of Park and Ride. Padova has a very smart new tram which goes from the railway station to the edge of town along one street - perfect to have a car park on the end of it.
Padova was a Roman town and fragments of the amphitheatre exist in a park close to the Scrovegni chapel. One of the piazzas (Prato delle Valle) is built on top of the Roman Theatre.
Roman Amphitheatre Piazza d'Erbe (so many fruit stalls) Prato delle Valle Basilica di San Antonio