The Musée de Normandie covers the archaeology and ethnography of the Normandy region from prehistoric times through the 20th century. It's a quieter and more focused museum than the Beaux-Arts next door, and well worth an hour for anyone interested in the region's history beyond the Second World War.
The prehistoric and medieval sections are particularly strong, with good coverage of Viking-era Normandy — a period that often gets overshadowed by the 1066 conquest despite being just as formative. The ethnographic collections document traditional Norman agriculture and rural life: tools, textiles, domestic objects. Entry is free.