Schloss Allner is a fifteenth-century castle located to the northeast of the town of Hennef and east of the district of Allner.
During its history it has served as a residence, a municipal seat and an orphanage. During World War II it was the scene of an unsuccessful attempt by the Wehrmacht to halt the advancing Allied forces from crossing the Sieg and entering the Ruhr Valley.
Today, Schloss Allner is a private residential estate.
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