Investigation Summary
Frankenstein Castle in the Odenwald, Hesse, is a medieval ruin (first documented 1252) famed for a disputed link to Mary Shelley's novel and as the birthplace of alchemist Johann Konrad Dippel (1673). The Shelley inspiration and ghost lore are legend and popular culture, not documented fact. Recorded by PRN as a reported/folkloric case — historical context, not proof.
Photo: Pascal Rehfeldt, CC BY-SA 3.0, via Wikimedia Commons