2. PreHistory of Skyscrapers Tower of Babel Great Pyramid of Giza, built in 2560 BC, was 146 meters tall
3. History of Skyscrapers Home InsuranceBuilding Chicago, 1884 Ten floors Sullivan’sWainwrightBuilding St. Louis, 1891 Ten floors
4. Someimportantskyscrapers FlatironBuilding NY 1902 87 m WoolworthBuilding NY 1913 214 m (worldtallestbuildinguntil 1930) WorldTrade Center (Twin Towers) NY 1973-2001 (Destroyed) 417 m EmpireStateBuilding NY 1931 381 m 102 floors