America's transcontinental railroad helped transform the United States into a global superpower, and today, cutting-edge engineering is behind hi-tech railways to once again revolutionize travel from sea to shining sea. 

The Eiffel Tower stands as the ultimate symbol of Paris and an innovative form of engineering that had never been achieved; now, architects reveal how this groundbreaking design holds the key to constructing the world's tallest skyscrapers of the future.