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

The Fluhenstein ruin, once a castle complex, rises on the southern outskirts of Berghofen in the Oberallgäu. Despite its dilapidated condition, it captivates visitors.
History+
The origins of Fluhenstein Castle date back to the 14th century. In 1361, the brothers Marquard and Oswald von Heimenhofen divided their possessions. Oswald acquired the lordship of Berghofen from the Abbot of Kempten Abbey in 1362 and moved the castle seat to a rocky outcrop. He systematically expanded his property. His son Berthold served the Dukes of Bavaria in 1398. In 1413, Berthold and Ulrich von Heimenhofen again divided their property, with Ulrich remaining at Fluhenstein. Due to over-indebtedness, Erkinger, Berthold's son, had to sell his share to Bishop Peter von Schaumberg of Augsburg in 1440. After Ulrich and Hans von Heimenhofen killed an episcopal serf, troops from the Prince-Bishopric of Augsburg occupied the castle in 1444. In 1463, the Diocese of Augsburg and Count Hugo von Montfort besieged the castle again after Ulrich von Heimenhofen was in a feud with the Imperial City of Kempten.
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: 47.5175, 10.3008