Humans have been building increasingly larger structures since they first learned how to build. The advent of lighter building materials in the late nineteenth century has resulted in ever larger structures. The use of computers and light weight materials has made it progressively easier to build large structures. Skyscrapers have altered city landscapes in such a way that they have become city trademarks. Bridges and tunnels have been designed that stretch the limit of the imagination and encourage architects to ever greater extremes. And buildings have become works of art that draw people in, more for the architecture than for the purpose of the building. Jefferis offers brief yet tantalizing images and text that show extreme structures and what the future may hold for ever greater structures. The colorful illustrations and the basic information provided will whet the appetite of children interested in the unusual. This title is part of the "Science Frontiers" series.