Hangvar church dates from the 13th century. The oldest parts are the choir and nave; the tower was built slightly later. The church has a decorated entrance portal, with sculpted capitals and a sculpture of a man's head above the portal. Internally, the church ceiling is supported by four vaults which rest on a central column. The base of the column is decorated with carved figures. Among the furnishings, the baptismal font is medieval, dating from circa 1250. The church has originally been decorated with six wooden sculptures dating from the Middle Ages but these are now displayed in the Gotland Museum in Visby. The altarpiece, made of wood, dates from 1684, while the pulpit is from 1633.
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.