Twelve suggested walking tours of European cities from Rouen to Dubrovnik by way of castles, cathedrals, fountains, and even zoos (the Alpenzoo in Innsbruck). This husband-and-wife team aims at selectivity rather than completeness; their flexible itineraries through quiet cities (Ravenna rather than Milan, Berne and Lucerne rather than Zurich) are geared to casual variation of pace.