Hohenbaden Castle, built in 1102, and known locally as the Altes Schloss (Old Castle) was home from the 11th-15th century to the margraves of Baden. During its heyday in the 15th century, the castle had 100 rooms. In 1479 margraves moved their seat to Baden and the old castle started to decay. In 1599 it was destroyed by fire.
From the tower you have a good view over Baden-Baden and distant view of the Rhine valley. The courtyard of the ruins is also worth of seeing.
References:The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.