Deep in northwestern Westphalia, Germany, stands a twelfth-century castle conceived by Heinrich Himmler, leader of the paramilitary Schutzstaffel, as a kind of “Camelot” for the triumphal knights of the Aryan race. The Wewelsburg Castle was also a fantasy nerd’s dream come true. In its bowels lies an occult enclave straight out of Cecil B. DeMille: an Arthurian -style set of catacombs designed to look medieval but actually made of concrete. Above, in the Hall of the Supreme S.S. Leaders, there’