How does a bridge withstand the forces of nature and traffic? Host David Macaulay takes viewers from the stone arch bridges of the Roman Empire to Japan's giant, all-steel Akashi Kaikyo suspension bridge, the longest in the world. Through the epic sagas of the Brooklyn, Golden Gate, and other great bridges, Macaulay shows how engineers have conquered ever-wider spans with better construction materials and innovative designs.

• David Macaulay