The remains of the Castle can be visited
Drachenfels Castle

On a sandstone rock in the southern Palatinate Forest, near Busenberg, lies the Drachenfels castle ruin. The tower remnant known as the “Backenzahn” (molar tooth) makes the ruin a landmark in Rhineland-Palatinate.
History+
The origins of Drachenfels Castle are shrouded in mystery, as archaeological finds before the mid-13th century are missing. The first documented owner, Walter von Drachenfels, is mentioned in 1245. In 1288, a dispute between the cousins Rudolf and Anselm von Drachenfels and the Bishop of Worms was settled, with a dragon in a pointed shield serving as the seal motif. From the early 14th century, the seal motif changed to a stag's antler or a wild goose. The castle was besieged and damaged in 1314 during a military campaign by Strasbourg against Berwartstein Castle. In 1335, conflicts with Strasbourg arose again, with the Lords of Drachenfels being referred to as robber knights.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=1477
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: 49.1217, 7.8281