Hogrän Church consists of a Romanesque tower and a Gothic nave and choir. The tower thus is the oldest part of the church, dating from circa 1200. Attached to it was originally an earlier stone church, also Romanesque in style and erected during the 12th century. During the 14th century, it was however replaced by the presently visible Gothic nave and choir. A few details from this earlier church, such as a few sculpted reliefs and a Romanesque window-frame, have been incorporated in the Gothic church.
The interior of the church is characterised by the broad width of the nave (10 metres). The church contains a number of medieval items. The triumphal cross is one of the oldest wooden sculptures from Gotland, dating from the 12th century. The finely carved doors of the tabernacle are from the early 15th century, and the door of the sacristy is likewise medieval. The baptismal font, probably a work by the craftsman or workshop known as Master Byzantios, is from the late 12th century. Of later date are the altarpiece (1634), the pulpit (1637) and the choir stalls (17th century but with incorporated medieval elements).
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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.