Skyscrapers exist in every major city in the world. From New York City, Shanghai, Kuala Lumper, Beijing, Chicago or Dubai, you will come across many tall skyscrapers. Only a century ago, it was virtually inpossible to build a structure more than five or six stories high. In 19th century stone or brick builings,each floor put more and more wight on it from the floors above. This wight limited how high engineers could build. Today, different building techniques and technologies are used. But why don't very tall skyscrapers collapse under their own immense wight?