Frankenstein Castle (German: Burg Frankenstein) is a hilltop castle in the Odenwald in Germany. It is thought that this castle may have been an inspiration for Mary Shelley when she wrote her 1818 Gothic novel 'Frankenstein'; or, 'The Modern Prometheus'.

Frankenstein Castle is in southern Hesse, Germany, on the spurs of the Odenwald mountain range at an elevation of 370 m (1,210 ft) close to the southern outskirts of Darmstadt. It is one of many historic castles along the Hessian Bergstraße Route, also famous for its vineyards and its mild climate.

Frankenstein is a German name consisting of two words: The Franks are a Germanic tribe and "stein" is the German word for "stone". Accordingly, the meaning of Frankenstein is "Stone of the Franks". The word "stein" is common in names of landscapes, places and castles in Germany. Consequently, the term "Frankenstein" is a rather ordinary name for a castle in this region.

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