Gothenburg Cathedral (Gustavi domkyrka or Göteborgs domkyrka) lies near the heart of the city. The cathedral was built in 1815 and replaced an earlier cathedral built in the 17th century. The architect was Carl Willhelm Carlberg. The cathedral is a fine example of neoclassical architecture. It is one of the top tourist destinations in the city. The Cathedral acts as a venue for a wide range of classical concerts and recitals, as well as hosting regular services.
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.