There is an excellent scholarly work on this subject, The Master Plan: Himmler's Scholars and the Holocaust by Heather Pringle. It's one of my favourite books on WWII.
Hitler employed Heinrich Himmler to rewrite ancient German history to make his master racial ideology more favourable to the general public. Himmler was a fan of archaeology and mysticism, and created a historical organization called Ahnenerbe, whose job was to lead teams around the world from Europe to Asia in an effort to discover archaeological "evidence" that could be tweaked to create the history of the Hitler's "Aryan" master race. Himmler used ancient texts from Roman and Indian tradition to craft this idea of an Indo-European race of conquerors who settled in Germany's ancient territories, and from whom "true" Germans would be "descended."
In this book you learn about the lengths the teams went to procure these arefacts, vandalizing cultural heritage sites in Finland, Poland, and Germany to take pieces of monuments back to German museums for the historians to analyze. The symbolism behind the swastika and other SS emblems are explored when Himmler looked into Germanic and Indian mythology for support from the warrior cultures of Northern Europe and Asia. The occult mysticism that sprang from this relentless perversion and distortion of world history and myth is regrettably continued today with white supremacist movements such as the Odinists, who believe that only white people are capable of understanding and honouring the Germanic gods.
Himmler's tactics highlight how incredibly brilliant and how incredibly dangerous he was, in my mind equally if not more dangerous than Hitler was as a politician. He successfully convinced German citizens that their history and pride was rooted in a completely fictional idea, and led anyone who did not physically conform to this to their deaths in concentration camps.
It's a fantastic read and was a real eye-opener for me. An excellent reminder of how we must be careful to document history accurately lest it be reinterpreted for malicious intent.