What organization has one of its official capitals in the country which contains the village of Nothum?
Nothum: Nothum (Luxembourgish: "Noutem" ) is a village in the commune of Lac de la Haute-Sûre, in north-western Luxembourg. Luxembourg: Luxembourg ( ) (Luxembourgish: "Lëtzebuerg" ] ; French: "Luxembourg" , German: "Luxemburg" ), officially the Grand Duchy of Luxembourg, is a landlocked country in western Europe. Luxembourg:  Its capital, Luxembourg City, is, together with Brussels and Strasbourg, one of the three official capitals of the European Union and the seat of the European Court of Justice, the highest juridical authority in the EU.
European Union