Näsby estate belonged to Uppsala archbishop in 1300s and in 1520s it was donated to Kristina Nilsdotter (Gyllenstierna). In 1571 it was acquired by Gustav Axelsson Baner. Originally built in the 1660s and designed by Nicodemus Tessin the Elder, the current Näsby Castle is located in the picturesque and natural setting of Näsbyviken. The castle was burned to the ground in 1897, but was rebuilt according to the original design on the initiative of Carl Robert Lamm and Dora Lamm who moved into the castle in 1905. Parts of the old castle garden still exist and are well preserved. Today Näsby is a conference center with a hotel and restaurant.
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.