Frossasco

The town has a square plan, with streets crossing at right angles as in a Roman camp. The Acaia fortified it with walls, towers and ditches: the circuit had twenty-eight towers, and stretches of the fourteenth-century walls remain. Frossasco is the only town in Piedmont that still has all four of its gates, though two were destroyed and later rebuilt.

One of them, the San Donato gate on the road to Cantalupa, was blown up on the night of 19 July 1965: someone had placed a charge of TNT at its base. It was rebuilt in the following years, and in 1971 a plaque was put up recording the episode.