This sprawling mess of a building used to be the headquarters of the Council of the European Union until the official HQ moved next door to the new Europa building. Built in the 1990s, the Justus Lipsius has 24 km of corridors and capacity for over 2,500 staff, a veritable town under one roof. Most departments of the Council’s General Secretariat remain in the Justus Lipsius. The building is used for lower level meetings of the Council and its preparatory bodies, for example trilogues (see jargon section on page 142 ). It also houses a press centre. The Council brings together the governments of the EU’s member states and is one of the most impenetrable institutions of the EU: a veritable ‘black box’ for outsiders.