The story of bridge building from earliest history to the present, which gives, in terms of human development, progress in engineering, metallurgy, mathematics, art and society. The where, when, how and why of bridges of yesterday and today, in Europe and America, and the man who created them, in answering the challenge of the impossible. The combination of head, heart and hands that went into the work. All types of bridges, from the primitive and natural bridges, wooden, iron, steel, military, railroad and highway bridges, with special chapters on world famous large span bridges and the men of vision that brought them into being. Problems, costs, failures and successes, a record of triumph over natural forces.