A series of massive standing stones in Germany's Teutoburg Forest formed the center of an ancient Germanic religion – or so the Nazi party claimed. Led by SS commander Heinrich Himmler, Nazi archaeologists attempted to uncover the sacred sites of a pure Aryan religion. From the site of German victories over ancient Rome, to a medieval castle associated with the Holy Grail and a prehistoric site of human sacrifice, the Nazi propaganda machine turned real discoveries into dark myths that bore little relationship to history. But their warped ideology would have catastrophic consequences for millions.