The castles became a Habsburg possession in 1333 and served as a summer retreat for the imperial family. The three castles are the 'Old Castle', the 'Blauer Hof ' or the 'New Castle' and the 'Franzenburg' Palace, situated on an island. The 'Blauer Hof 'Palace was the birthplace of some members of the royal family such as Crown Prince Rudolf and his sister Gisela.

The site is also a venue for film & photo shooting, corporate and private events, such as receptions, weddings...

For more detailed information concerning history, visits and events, see website.