The village of Schengen in Luxembourg lends its name to one of Europe's most ambitious agreements - creating a free travel area that now extends to 29 countries. But increased worries over migration, and other crises including Covid-19, have led to the return of border checks, and a quiet fizzling of the dream of a borderless Europe. Is it in terminal decline? Our Germany Correspondent Oliver Crook joins Stephen Carroll to discuss. 

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