Östergarn church is a little 13th century church where the tower of was never built. It was burnt by the Swedes in 1565 during the Nordic Seven Years' War, whereat all medieval fittings were destroyed. It was also sacked by the Russians in 1715 and 1717. In a grave in the church yard lie the German seamen who fell on board the cruiser Albatross, when she was compelled by superior Russian forces to run ashore near the fishing village of Herrvik in Östergarn in 1915.
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.