Vianden is a castle built between 11th and 14th century on the foundation of a Roman fort. It is certainly one of the largest and most beautiful feudal residences of the gothic period in Europe.
Several hundred years ago Luxembourg fell under Dutch rule. William I of the Netherlands was not interested in the castle and eventually he sold it to a local merchant. Since then no proper maintenance was done and the place was left in ruins. Only in the late 1970s the castle was restored and returned to its former glory.