The district town of Alzey with its impressive castle lies in the middle of the Rhine-Hessian hill country. The building, which presumably originated from a Staufer imperial castle, was expanded into a castle in the 16th century and is located on the remains of the city wall. After being destroyed in the Palatinate War of Succession, the castle was not rebuilt until the beginning of the 20th century by the Grand Duchy of Hesse. The round tower in the south-west corner of the castle, which was built as a turret under Elector Friedrich I, is impressive. Today, the Alzey castle houses the girls’ boarding school of the Alzey Aufbau- und Kunstgymnasium in addition to the district court. In summer, the open-air music festival Da Capo! is held annually in the idyllic castle courtyard.