The wow! factor was there from the start. We have all gazed upwards in awe. For centuries, Gothic spires dominated the city skyline and then, thanks to the invention of the steel frame, elevators, and several other key advances in building technology, office towers outreached them, and the competition to build ever higher is as lively as it was a hundred years ago, when the Woolworth palazzo broke the record. In his second book on the high-rise, Scott Johnson moves beyond height and structure, to review ways in which skyscrapers can perform better and make a positive contribution to the environment.