Morlaix, one of the great old Breton ports, thrived on trade with England during the “Golden Period” of the late Middle Ages. Built up the slopes of a steep valley with sober stone houses, the town was originally protected by an eleventh-century castle and a circuit of walls. Little is left of either, but the centre remains in part medieval with its cobbled streets and half-timbered houses. The present grandeur comes from the pink-granite viaduct, carrying trains from Paris to Brest, that towers above the town centre.