The construction of the Gothic Soissons Cathedral south transept was begun about 1177, and the lowest courses of the choir in 1182. The choir with its original three-storey elevation and extremely tall clerestory was completed in 1211. This was earlier than Chartres, on which the design was supposed to have been based. Work then continued into the nave until the late 13th century.
The single western tower dates from the mid-13th century and is an imitation of those of Notre Dame de Paris, which it equals in height. The tower was restored after it and part of the nave were severely damaged in World War I. A matching tower on the other side of the façade was originally planned, but never built.
The graceful southern transept, the oldest portion of the whole edifice, terminates in an apse. Unlike the rest of the building, it is divided inside into four (rather than three) levels.
The choir end of the cathedral has stained glass from the 13th century. A tapestry from the 15th century depicts the life of the martyrs Gervasius and Protasius, the patron saints of the cathedral. Rubens' Adoration of the Shepherds hangs in the northern transept, as does a painting by Philippe de Champaigne.
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.