The capital of Liechtenstein, the world's fifth smallest country, is the country with the highest GDP per capita, although it is small and has only a population. From Switzerland, you can take the train to Sagans and then change the bus at the train station to get off at the post office. The city's main attractions are basically on the streets near the post office, where the National Museum and Stamp Museum are worth a visit. Also highly recommended is the treasure house, the Swiss pass does not include the attraction, and the area is small, but the royal boutique treasure is definitely not disappointing.