Part of Nazi doctrine was to establish the regime as a centre of importance for engineering, architecture and culture. Many structures were modelled off buildings in ancient Greece and Rome, with the regime intending them to last for thousands of years. Tempelhof Airport was built to be the gateway to Germania and be the seat of aviation. Experts analyse the construction and vision of the airport to reveal secrets about the Nazis. Watch Secret Nazi Science on Wednesdays at 8pm on National Geogra