The western part of the nave and the church tower are the oldest parts of the asymmetrical Vallstena church. They date from the early 13th century. A new chancel arch was built at the middle of the same century, and around circa 1300 the new choir was built. Reconstruction of the nave also started around this time; the original plan seems to have been to replace the entire nave with a new, larger nave but for some reason the work came to a halt. Similar, half-rebuilt churches are relatively common on Gotland. The sacristy was also built at this time. The interior of the church was decorated with church frescos during the 15th century.
The church and its cemetery is surrounded by a low wall, with three lychgates. The oldest of these dates from the 13th century and display some original sculptured details.
The baptismal font is the oldest fitting of the church, dating from the middle of the 13th century. The altarpiece dates from the 14th century and was acquired when the new choir was inaugurated. From the same century dates a crucifix, as well as a richly decorated chest for donations for the poor. From the 14th century are also to tombstones on either side of the altar, carrying inscriptions in both Latin and Old Gutnish; the latter in runes. A few 14th century wooden statues depicting saints originally from Vallstena Church are today housed in Gotland Museum in Visby.
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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.