From rugged wilderness on the Spanish frontier to the Old City of Porto, the River Douro weaves its way through one of Europe’s most beautiful landscapes with charming villages and historic landmarks weaved throughout its banks. Known as Portugal’s ‘River of Gold’, the Douro flows through one of the world’s oldest wine regions producing both the legendary port wine and some of Portugal’s best vintages. Seeming to defy gravity, the Douro Valley, with its impossibly steep terraces covered in vines, is simply stunning and just one of four Unesco World Heritage Sites traced by the river. The spectacular Douro is perfect for a leisurely river cruise, navigable by way of breathtakingly high locks.