Luxembourg is a founding member of the European Union, an international organization that allows for the free movement of goods, capital, and services for the 27 European countries which are members, according to the UK Government website.
Luxembourg is also home to one branch of the European Parliament, which has a number of democratic responsibilities, including passing EU laws, and democratic scrutiny of all EU institutions, according to the EU website. There are two other branches in Strasbourg, France, and Brussels, Belgium, the website states.
While it's possible to arrange free tours of the parliament, these can only be arranged for groups of 20 to 50 people and should be booked two weeks in advance, according to the European Parliament website. Therefore, I settled for seeing the exterior of the building.