In part they did this through simple looking architecture
“…The architectural style used by the Nazis delivered and enforced their ideology. Formal elements like flat roofs, horizontal extension, uniformity, and the lack of decor created “an impression of simplicity, uniformity, monumentality, solidity and eternity,” which is how the Nazi Party wanted to appear…”
This video provides colourful insight into the “strange” epoch of pre-World War Two Germany. Take a close look at the architecture in Munich and Berlin around that time.