The Ruin can't be visited
Reußen Castle (Ruin)

The Reußenburg ruin, also known as Reußenberg, was once a hilltop castle on a hill near Höllrich in the Lower Franconian district of Bad Kissingen, Bavaria. Its history is linked to the turmoil of the 16th century.
History+
Around 1320, the Barons of Thüngen emerged as landowners in Bonnland and, eleven years later, in 1331, erected the Reußenburg on a neighboring hill. Reuß I. von Thüngen was mentioned as the owner of the locality in 1356. The late 15th and early 16th centuries were a period of insecurity in the German Empire, marked by robber knights who ambushed travelers. Although an eternal public peace was declared at the Diet of Worms in 1495, the situation did not improve. The Swabian League, founded in 1488 and appointed as the imperial executive in 1489, was intended to curb these attacks.
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: 50.0678, 9.8208