SCHENGEN, LUXEMBOURG - MAY 11: A road sign marks the border of the town of Schengen where the 1985 European Schengen Agreement was signed on May 11, 2016 in Schengen, Luxembourg. The Schengen Agreement, which led to the creation of Europe's borderless Schengen Area, was signed on 14 June 1985 in the small hamlet of Schengen at the tri-border point of Germany, Luxembourg and France. (Photo by Christopher Furlong/Getty Images)
