Fodor's Expert Review European Parliament
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), you can slip into the hemicycle and witness the tribune in debate, complete with simultaneous translation. Note: you must provide a pièce d'identité (ID) before entering. You don't have to reserve in advance, but space is limited so arrive early. If you do get in, you can also visit Le Parlamentarium, where high-tech, interactive modules explain how the European Union works.