The European Museum was opened on 13 June 2010, 25 years after the signing of the Schengen Treaty, in the Centre européen building. The permanent, trilingual exhibition on the history and significance of the Schengen Agreements, on of exhibition space, shows visitors the elimination of the control of persons at the internal borders, put into practice as one of the four foundational European freedoms in the 1957
Treaty of Rome. The signing of the Agreement is documented with historic photos and video and sound footage as well as statements by those involved at the time. ==Twin towns — sister cities==