Vienna was the home of the Royal House of Liechtenstein for generations until the Anschluss (annexing of Austria into Nazi Germany) in 1938 forced them back to their tiny mountain principality between Switzerland and Austria. The family left two baroque palaces full of treasures: the City Palace and the Garden Palace. After decades of gathering dust, Prince Hans-Adam Ii's private collection of artwork, known as the Princely Collections and showcasing works from the 16th to the 19th centuries, was transferred back to Vienna and installed into the fabulously ornate Garden Palace. The architecture of the Garden Palace is also a masterpiece, with opulently frescoed apartments decorated by the Austrian Baroque master Johann Michael Rottmayr and complemented with sweeping marble staircases and ceiling paintings by Andrea Pozzo.
The Garden Palace is used for private events and the art collection can only be viewed by joining a public tour (in German; English audio guides are provided).