Uniworld's Queen Isabel provides an up-close and unforgettable view of Portugal's Douro River Valley—a designated UNESCO World Heritage Site—renowned for its dramatic, rugged scenery and pristine waters. Named after Portugal's beloved queen, this boutique 116-passenger vessel is the most unique and stately ship on the Douro, a wonderful place to admire the region's steeply terraced hillside vineyards and charming wine estates.