Trollenäs Castle is known since the 14th century, and has been in the ownership of only two families, Thott and Trolle. Originally known as Näs Castle, it was renamed after Trolle family in the 18th century. The current building goes back to 1559 and was in the late 19th century renovated by architect Ferdinand Meldahl to resemble a French Renaissance castle.
There is also a medieval church, Näs old church, near the castle. The castle is open to the public, offering facilities for weddings, conferences, dinners, and other festivities. In the park there is a café.
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.