The castle ruin has a history going back 1000 years and now forms the venue for stories with a fairy-tale touch: during a one-hour guided tour of the castle, visitors take a trip back in time. One of the historical vaults now accommodates a registry office. And from time to time the castle ruin becomes the romantically lit backdrop for concerts and theatre events.
At the foot of the historic castle ruin lies the Hardenberg Keilerland estate with various attractions: the Gräflich von Hardenberg‘schen (Count of Hardenberg) corn distillery with its continuing tradition of distilling fine spirits, the Hardenberg Keilerschänke tavern, the Keilerladen shop and the romantic Castle Park. The Hardenberg Atrium regularly hosts lively celebrations and classical concerts. And every year the Hardenberg equestrian arena is the scene of an international show-jumping tournament: the Hardenberg Burgturnier.