The Roman theatre of Verona should not to be confused with the Roman amphitheatre known as the Verona Arena. The theatre was built in the late 1st century BC. Before its construction, two walls were built alongside the Adige River, between the Ponte di Pietra and the Ponte Postumio, to protect it against floods.
Today only remains of the edifice are visible, recovered starting from around 1830. They include the cavea and the steps, several arcades of the loggias and remains of the stage. Part of the cavea was occupied by the church of S. Siro, built in the 10th century and restored in the 14th century. At the top of the hill there was an ancient temple, built on a series of terraces.
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.