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The City of New York, most often called New York City, is the most populous city in the United States, in a metropolitan area that ranks among the world's most-populous urban areas. It is a leading global city, exerting a powerful influence over worldwide commerce, finance, culture, and entertainment. The city is also an important center for international affairs, hosting the United Nations headquarters. The city is sometimes referred to as "The City That Never Sleeps" due to its extensive 24-hour subway system and constant bustling of traffic and people, while other nicknames include Gotham and the Big Apple. The city has been home to several of the tallest buildings in the world, including the Empire State Building and the twin towers of the former World Trade Center.