This week, the European Union celebrates a landmark moment in its history - the 40th anniversary of the Schengen Agreement, a deal that transformed life on the continent by removing internal borders and enabling the free movement of people. The agreement was signed on 14 June 1985 in the village of Schengen in Luxembourg by five founding countries: Belgium, France, Germany, Luxembourg, and the Netherlands. At the time, the idea of open borders seemed bold, even radical. Today, that vision has