Cornia Nou is a settlement dating from the Talayotic period (1000-750 B.C.) with two well preserved talayots of different types. The oldest and most spectacular is circular and measures around 26 metres in diameter, an impressive monument. It has a building in the facade with access at ground level; an inside passageway ascends to a set of steps leading up to the upper platform of the talayot.The other talaiot is considerably smaller and has a distinctive feature of a passageway covered with stone slabs crossing its diameter and joined to a wall. Excavation work carried out in 2007 uncovered the remains of pottery items dating from the post-Talayotic period in the 3rd century B.C. Plus, near the site there is a large Islamic necropolis with burial chambers carved out of the rock, which supports the hypothesis that rural settlements from the Muslim period were built on top of the sites from the Talayotic period.
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.