On May 9, 2016, the castle was severely damaged by a fire in the roof truss. The renovation will take some time. Seat of power as early as the 13th century. Today's appearance after reconstruction in 1842 by Archduke Maximilian Habsburg d'Este, a grandson of Maria Theresa (burial place in the cemetery). The chateau passed to a Bourbon line by inheritance. In 1971, Prince Carlos Hugues de Bourbon donated the castle to the municipality of Altmünster. Current owner: The state of Upper Austria, which set up a hospitality vocational school here (1986). The castle park with its unique botanical specimens and the rose garden is worth seeing. The mighty castle has two courtyards and is a product of generous conversions and extensions. The front courtyard is surrounded by three wings of the castle, is also surrounded by a wide wall and is one of the treasures of the castle. In its center is a stone, octagonal well with carved coats of arms and a stone central column. The facade of the right wing is not decorative, whereas the left wing is more loosened up by supporting pillars. The two upper floors of the central wing have glazed arcades. In the middle a slender clock tower with a cornice gable. Impressive is the rear facing the lake, which has 75 windows. It also has a portico with architrave and pointed gable, based on the classic Greek model. The park, which extends to the Traunseebundesstraße, is also tailored to the imposing facade of this castle.