Taking to the high seas, Ben Parker and Simon Calder take a look at the best of European cruise holidays. Whether a summer escapade in the Mediterranean is taking your fancy or you're hoping to find a hidden gem, this episode of Travel Smart looks at what to do when off the cruise ship . Simon takes you on a tour of the best port destinations including Barcelona and Porto , while Ben takes a look at a trip down the Rhine and Danube rivers to find less-visited sites.
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