Like Laeken and Neder-Over-Heembeek, the former municipality of Haren was annexed by the municipality (City) of Brussels in 1921, which allowed the extension of the Schaerbeek railway station north of its territory. But it is the presence, southwest of the town, of an airfield, created by the Germans during the First World War, and where the Belgian national airline Sabena was born, which precipitated the annexation of Haren. For almost fifty years, Haren has been home to NATO's headquarters. It is also the location of many other administrations and companies, such as the headquarters of Eurocontrol.