Schloss Orth, château in Orth an der Donau, Austria

Schloss Orth is a castle with four square corner towers and an irregular layout, surrounded by water channels from the Danube River. The structure displays both medieval and later architectural elements throughout its form.

The castle was first documented in 1201 and suffered severe destruction in 1529 by Ottoman forces during their campaign toward Vienna. Following this invasion, reconstruction and alterations transformed the building into what exists today.

The castle presents exhibitions about the Donau-Auen National Park and showcases the river's wildlife through interactive displays. Visitors can discover how water and nature are part of daily observation here.

The schlossORTH National Park Centre is open daily from 21 March to 1 November. It provides information and a booking service for guided national park tours, and gives access to the DonAUräume exhibition and the Schlossinsel outdoor area with animals and plants of the floodplain landscape.

The four-tower water castle was first mentioned in a document in 1201 and belonged to the Lengenbachers, one of the most powerful noble families under the Babenbergs. Its early form resembled the oldest part of Vienna's Hofburg, the Schweizertrakt. In 1460 Gamareth Fronauer fled through underground passages before the castle was taken without a fight on 26 March.