The construction of defensive tower, the oldest part of Hulterstad Church, was completed around the year 1200. There are also some remains of older building from the early 1100’s below the ground. In 1803 the church was reconstructed to the present, single-nave and rectangular shape.
The interior originates from several centuries. Oldest artefacts are the baptismal font and the painted consecration cross from Middle Ages. Mural paintings in arches were painted in the 1600s. The large bell was made in 1631 by Jurgen Putensen. The organs date from 1867, designed by L. Hedin. In 1676 the royal warship wrecked outside Hulterstad and a most of the crew were buried in the cemetery.
There is a small museum in one of the tower's floors including some runestones. Some stones have been found under the tower's ground floor.
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.