The remains of the castle can be visited
Gruibingen Castle

The Gruibingen Castle remains are a former spur castle. Its sparse remnants are located on a mountain spur above Gruibingen in the Göppingen district.
History+
Gruibingen Castle was probably built in the 13th century. A noble family, who named themselves after the castle, first appeared in documents in 1237. These Lords of Gruibingen served as seneschals to the Counts of Spitzenberg-Helfenstein in 1391. It is assumed that the castle was abandoned as early as the 14th century, as it is no longer mentioned in later documents.
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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: 48.5832, 9.6507