From 1739 to 1746, the Deutschordenschloss was built according to the designs of Johann Caspar Bagnato and under his supervision. Despite limited finances, the result was an architecturally well-balanced, symmetrical palace complex of great harmony. The arms of the two side wings open towards the mainland in a horseshoe shape. In contrast, the wide side faces the lake. The building rests on a base above which two storeys rise. Magnificent on the west gable: the coats of arms of Grand Master Clemens August von Bayern, Landkomtur Philipp von Froberg and Mainaukomtur Friedrich von Baden. The east gable facing the lake bears the coat of arms of the Teutonic Order, and Bagnato's design dispenses with a magnificent, representative staircase based on the Würzburg model. The upper floors are reached via simple staircases in the side wings and the heart of the palace is the former audience hall, the so-called “White Hall”, which was only given its present appearance in 1883. It is only open to the public for concerts or special events. The Coat of Arms Hall, the central room in the basement of the original Corps de Logis, is also open to the public as part of changing exhibitions. The castle and church form a magnificent, harmonious ensemble with their clear architectural language - they are a unique example of southern German Baroque.
The lower area is accessible to visitors for exhibitions, events and in the castle café area.
