The remains of the castle can be visited
Sirgenstein Castle

The castle ruin Sirgenstein is a former rock castle on a more than twenty meter high rock at 614 m above sea level with a cave inhabited in the Stone Age, the Sirgenstein, between the towns of Blaubeuren-Weiler and Schelklingen in the Alb-Donau district in Baden-Württemberg.
Of the castle, presumably built in the 13th century, a wall remnant, a bossage stone, and the neck ditch can still be seen today.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Peter Kreuzmann / CC BY-SA 4.0 via Wikimedia Commons
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: 48.3876, 9.7602