The silvery, 1,776-foot skyscraper that rose from the ashes of 9/11 to become a symbol of American resilience opened for business Monday, as 175 employees of the magazine publishing giant Conde Nast settled into their first day of work in their new offices.

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Click to read about the World Trade Center re-opening 13 years after 9/11.

Scroll below to learn more about the new skyscraper at the former Twin Towers site.