Copyright 2015 NPR. To see more, visit STEVE INSKEEP, HOST: Travelers to Europe know this reality. Once you're in the heart of Europe, you are in. You can cross many borders without showing papers in what's called the Schengen zone. That's how it's been. The Paris attacks may be changing that. NPR's Peter Kenyon reports from Paris.PETER KENYON, BYLINE: At the Gare du Nord train station over the weekend, traveler bottlenecks grew as police selected passengers for passport and baggage checks. It's a huge change from the normal travel experience between France and its neighbors. But in the current fearful atmosphere, passengers seem to accept it.ANDREA DUPONT: Hi, my name is Andrea.KENYON: Eighteen-year-old Parisian Andrea DuPont says she was shocked to learn how easily some of the Paris attackers moved in and out of France, and she finds the police reassuring.DUPONT: It's totally OK. Well, I just prefer waiting more and have, like, more security control than having attacks, for sure -
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