This sleek building testifies to the growing importance of the governing body of the European Union, which used to make do with rental offices in the Palais de l'Europe. Eurocrats continue to commute between Brussels, Luxembourg, and Strasbourg, hauling their staff and files with them. One week per month (August excepted), visitors can slip into the hemicycle and witness the tribune in debate, complete with simultaneous translation. Note: You must obtain a written appointment beforehand and provide a pièce d'identité (ID) before entering.
Behind Palais de l'Europe, Strasbourg, 67000, France