The oldest parts of Heda Church were built in the early 1100s. It was renovated to the Cistercian style in the late 13th century. The church was enlarged between 1855-1858.
The most interesting detail in Heda church is the fine collection of medieval wooden sculptures. The most famous of these is a remarkably well preserved wooden sculpture of the Virgin Mary as Queen of Heaven, which is more than eight hundred years old. The church also possesses other images of the Madonna, a thirteenth century oak crucifix, a medieval image of John the Baptist and a fifteenth century triptych, made locally. There are ancient rune stones built into the church wall.
References: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.