The remains of the Castle can be visited
Baldenstein Castle (Ruin)

The Baldenstein Ruin, often also referred to as the Old Castle, stands on a rocky spur above the Fehlatal near Gammertingen. This hilltop castle was once the presumed ancestral seat of the Counts of Gammertingen.
History+
The construction of Baldenstein Castle is dated between 1050 and 1100, likely by the Counts of Gammertingen as their ancestral home. Around 1150, the complex fell victim to a fire, though not due to military conflict. Following this destruction, no reconstruction took place. The line of the Counts of Gammertingen died out between approximately 1170 and 1180.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 48.2312, 9.2052