The tiniest things are often the most precious ones. Luxembourg is such a gem. It’s one of the smallest countries in the world, also one of the richest. Luxembourg City, the capital, in particular, is exceptionally prosperous and cosmopolitan. In a multilingual country like Luxembourg, the capital has many names. In French it is called Ville de Luxembourg, while the German-speaking inhabitants will call it Stadt Luxembourg or Luxembourg-Stadt. And in Luxembourgish, the country's third national language, the name Stad is Lëtzebuerg or d'Stad. People think Luxembourg is a city-state like Monaco or the Vatican, but it’s a little too big for that. Grand Duchy is what they call themselves. Basically it’s a monarchy with a Duke instead of a King. History aside, it’s just for the sake of...