What are the origins of the Aztec Empire? This fascinating episode steps back in time to discover this civilization and its capital city Tenochtitlan, built on a raised island with canals for the 250,000 inhabitants to travel on. Did you know it was the Aztecs who first discovered the many foods we take for granted... chocolate, corn, beans, chili and avocado? The Aztec people also enjoyed the taste of worms and insects. The Aztecs also devised the idea of 'chinampas' – man-made artificial islands used to grow crops.