Ununge Church was probably built at the end of the 13th century, but has been rebuilt and expanded on several occasions. The easternmost part of the church has been dated to the end of the 14th or to the 15th century.
In its layout, the church is a typical example of medieval churches from Uppland. It consists of a rectangular, single-nave church hall consisting of three bays of which the easternmost is the choir. There is a sacristy to the north and a church porch to the south. The oldest of the church fittings are the triumphal cross from the 13th century, which has been described as one of the finest of its kind and Sweden and which resembles contemporary triumphal crosses from Denmark, and the baptismal font, also from the 13th century. The interior of the church was renovated in 1897.
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Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.