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The first terrorist attack on the world trade centers occured in 1993. A bomb was placed in the basement. https://en.wikipedia.org/wiki/1993_World_Trade_Center_bombing
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On September 11th, 2001 another terror attack occurred. This time using commercial aircraft. http://framework.latimes.com/2010/09/10/terror-attacks-sept-11-2001/
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6 months later major progress had been made with the cleanup efforts. http://exhibitions.nysm.nysed.gov/wtc/recovery/groundzero.html
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15 years later several of the towers had been completed and work continues. http://www.dailymail.co.uk/news/article-3656417/World-Trade-Center-skyscrapers-3-1-go.html
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The final look of the World Trade Center will be one of the future. http://www.cnn.com/2015/06/12/travel/two-world-trade-center-tower-big/
