The cable car in the castle is based on the 1968 movie "Where Eagles Dare", where a U.S. Army Brigadier General is captured and taken prisoner to the "Schloß Adler", a fortress high in the Alps above the town of Werfen, reachable only by cable car, and the headquarters of the German Secret Service in southern Bavaria. The supernatural element is based on the story of Castle Wewelsburg, a 17th-century castle occupied by the Germans under Heinrich Himmler's control, and used for occult rituals and practices.