Castle Karpathenburg is a allegedly haunted castle in Transylvania. In 1892, the haunting of Castle Karpathenburg was debunked as a hoax in which its perpetrator blown up both his castle and himself in what was described by Mina Murray "to have been terrible chagrin."
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Karpathenburg Castle is from Jules Verne's Le Château des Carpathes ("The Castle of the Carpathians," 1892).