With only 38,500 inhabitants in a territory exactly the same size as the District of Columbia, Liechtenstein is the world’s wealthiest country. According to the World Bank, its annual per-capita income is $175,813, ranking Liechtenstein ahead of Monaco, Luxembourg, Switzerland and Bermuda. Yet this 62-square-mile, German-speaking principality—wedged in between Switzerland and Austria—isn’t exactly a household name for everyone, conceded Liechtenstein’s ambassador to the United States, Georg Sparber.