The ancient Odeon of Thasos, an conservatory in the ancient city of Thassos was built in Roman times. The building, which was discovered in 1929 gives us the impssion of a monumental building even though its biggest part is under the modern road of the town with only its lower part visible and the first rows of seats. It is certain that in ancient times it would have been an imposing edifice. It is made of marble and situated in the south of the ancient Agora.
The building consists of a hollow with two rows of seats, forming a semicircle, one orchestra and a stage structure. The orchestra is not paved and from the byways survived the two walls that support the ground at the edges of the hollow.
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.