The Big Apple. Thousands of workers on the Empire State Building maintained a breakneck pace to finish the 1,454-foot skyscraper in just 13½ months. One of New York’s most beloved features, the building’s design changed 15 times until it was ensured to be the world’s tallest, a title it held until the 1970s when the World Trade Center opened. (Bettmann/Getty Images)
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