Skyscraper exist in every major city in h the world. From Newyork City, Shanghai, Kuala Lumpur, Beijing, Chicago or Dubai, you will come across many tall skyscrapers. Only a century ago, it was virtually impossible to build a structure more than five or sixYstories high. In 19th century stone or brick building, each floor put more and more weight on it from the floors above. This weight limited how high engineers could build. Today, different building techiques ang technologies are used. But why don't very tall skyscrapers collapse under their own immense weight?