On the approach to Valeggio, historic site on the Roman road to Turin and Gaul, the austere and imposing bulk of its thirteenth century castle is already visible from afar with its generally trapezoid plan and seven towers arranged asymmetrically and in varying forms and sizes. A necropolis with more than two hundred Roman origin tombs, the source of many of the archaeological artefacts now kept in the Lomellino Archaeology Museum in Gambolò, was unearthed here.