But in terms of the difference between traveling Europe on our own or cruising a river with Viking, both have their pluses.

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This ship, built in 2014, with sleek, contemporary digs, sails Portugal's Douro River. It was purpose-built in Portugal for the Douro's various winding curves and locks.

Viking announced it will launch a Mississippi River cruise line with its first vessel, Viking Mississippi, scheduled to sail voyages on the Lower and Upper Mississippi, between New Orleans and St.