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In May 1, 1931 The Empire State Building was opened. This building not only became an icon of New York City, it became a symbol of twentieth century man's attempts to achieve the impossible. The Empire State Building has one of the most popular outdoor observatories in the world, having been visited by over 110 million people. 3.5 million people visit the 86th floor observatory every year. Tourists may pay to visit the observation. The observation tower at the top of the Empire State Building was originally intended to be a dock for mooring airships. However, after several futile attempts at mooring a zeppelin in the strong winds present at 1250 feet, the idea was scrapped. The top of the Empire State Building is lit up at night in different colors to celebrate various holidays.