The lazy Dordogne and Lot rivers wind gracefully through some of France's most picturesque countryside. However, this itinerary is more than just traveling along river valleys, for the region is France's prehistoric capital: the Cro-Magnon skull was discovered at Les Eyzies; colorful 15,000-year-old paintings decorate the Lascaux, Font de Gaum, and Les Combarelles caves; and man occupied the terraces on the cliffside of La Roque Saint Christophe as long ago as 70,000 B.C.