Located on the hillside of Liechtenstein's first Waduz, the pocket kingdom of Europe, Waduzburg is a symbol of Liechtenstein. It was built in the twelfth century A.D. and is the oldest residence of the Royal family. Today it is the residence of Duke Hans-Adam II of Liechtenstein. The castle can't be visited inside, so it's just standing on the street and looking at it from afar.