[1] The castle gave its name to the town of Vaduz, the capital of Liechtenstein, which it overlooks from an adjacent hilltop.

The bergfried (the keep, built in the 12th century) and parts of the eastern side are the oldest.

The tower stands on a piece of ground that is 12 by 13 metres (39 by 43 feet) in area.

The original entrance lay at the courtyard side at a height of 11 metres (36 feet).

The western side was expanded by Count Kaspar von Hohenems [de] (1613–1640).