Why Go There: The Douro
Portugal's Douro River may be off the beaten track -- but it's an unforgettable experience.
Europe Highlights
Offering a vast range of adventures, Europe's rivers feature cosmopolitan cities, terraced vineyards, charming historic villages, and monuments and castles galore.
Viking River Cruises
Created specifically for river cruising, Viking's 13 Europe-based ships feature panoramic windows and promenades for scenic views.