The world's largest structures are revealed in this book on skyscrapers and towers. One of a series, it describes when the first skyscraper was built, how a skyscraper stays up and why skyscrapers are different in an earthquake zone. It illustrates the structures under ground as well as the steel frame of vertical columns and horizontal beams. Concrete frames are constructed around a central core but cannot reach the heights of steel frame structures. Floors and walls, fixtures and fittings, safety and comfort are all explained as is the full programme of construction from design stage to the topping out ceremony when the task is completed. Finally the book postulates on how tall the buildings of the future will be and facts are given about the world's tallest tower and oilrigs, the skyscrapers of the sea.