Travel to 12th-century China as engineers, scientists and scholars help reveal the intricate mysteries behind the revolutionary strength and elegance of the Rainbow Bridge.
Part of the series “Secrets of Lost Empires”. A special five-part NOVA series originally aired in February of 2000. In the series, NOVA crews attempt to ferret out long-forgotten secrets of early architects and engineers. How did they design and erect the medieval war machines known as trebuchets? Egyptian obelisks? The Easter Island stone monoliths called moais? Roman baths? The rainbow bridges of ancient China?