Mon Jan 29, 10:26 AM ET

In this June 28, 2006, file photo, released by Carnival Cruise Lines, the Carnival Liberty cruises down the Grand Canal in Venice, Italy. More American parents are finding that cruising, on U.S. company-owned ships, offers an ideal way to travel in Europe, versus conventional land-based vacations. (AP Photo/Carnival Cruise Lines, Andy Newman)

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