The fortified complex, originally fortified with a wide moat, was a strategically extremely important border fortress against the ongoing threat from the east. While there are no sources that refer to the rule of Burgau until the 12th century, the former moated castle "Burg in der Au" is named. In the 19th century the castle passed into state ownership from the Hungarian noble family Batthyány and finally in 1871 to the market town of Burgau. In recent years, the main building, the inner courtyard and the outer bailey with its distinctive round tower have been restored. In the course of the renovation work, a spiral staircase that had been missing for years was discovered behind vaulted arches. The once buried moat on the west side of the castle has been completing the impressive overall ensemble since 1998. The round tower houses the municipal office and a castle café, in the outer bailey there are apartments.
The basement of the main castle with its beautiful brick vault, the magnificent ballroom and the inner courtyard with the arcade vault are used for cultural events, weddings and congresses as well as for the Christmas and Easter exhibitions.