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

In the Rhein-Sieg-Kreis, North Rhine-Westphalia, the Herrenbröl Ruin is a historical structure. This former lowland castle, whose origins are obscure, dates back to the 13th century and can now be visited as a freely accessible ruin.
History+
The beginnings of Herrenbröl Castle, which likely served as a knight's seat, are presumed to be in the 13th century, from which some remains like the castle well still exist. Its first documented mention occurred on October 8, 1417, in connection with properties in the parish of Eitorf. In the 15th century, the Lords of Scheidt presumably expanded the complex with a tower and other building parts. In the mid-18th century, the castle came into the possession of the von Martial family through marriage. After the death of Franz Ferdinand Clemens von Martial in 1831, his inheritance, half of Herrenbröl, was divided among his descendants. The complex inheritance situation led to the property being sold to Carl Hundhausen in 1833, who resold it shortly thereafter. The castle, which was never of great strategic importance, was destroyed by French troops no later than around 1807.
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: 50.8379, 7.4508