Within Château de St-Malo, built by the dukes of Brittany in the 15th and 16th centuries, this museum examines the life and history of the city through a hodgepodge of nautical exhibits, model boats and marine artefacts. There are displays on the city's cod-fishing heritage, paintings, and info on famous locals, including Cartier, Surcouf, Duguay-Trouin and the writer Chateaubriand.
The castle's lookout tower offers eye-popping views of the old city.