The remains of the Castle can be visited
Godesburg Castle

The Godesburg castle ruin overlooks Bad Godesberg, a district of Bonn. Originally built as a refuge castle, the complex today offers a wide view over the Rhine Valley.
History+
The Godesburg, presumably built by the Franks as a refuge castle, was first mentioned in 722 as Woudensberg. A Roman altar stone was integrated into the castle walls. In 1210, the Archbishop of Cologne, Dietrich I, laid the foundation stone for a new construction. Archbishop Konrad von Hochstaden expanded the castle in 1244 with the first floors of the keep, which was later raised to 32 meters by Archbishop Walram von Jülich.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Joachim Schneeleopard
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: 50.6851, 7.1507