The Empire State Building rose to become the world's tallest man-made structure at a time when dreams were in short supply. Here is the colorful story of this beloved building, including the innovations it inspired, and its enduring popularity today. From the first plans to the final rivet.

The Eiffel Tower. It is called the Tower of Towers, symbol not only of a city and a nation, but also of the self-assurance and promise of an entire age. From the immense inclined buttresses at its base to Eiffel's personal apartment and the aerodynamics laboratory at its pinnacle, it's an unforgettable historical tour of the world's most famous and fabled tower.