![See Seven Years of 9/11 Memorial Construction in 90 Seconds [VIDEO]](http://townsquare.media/site/142/files/2011/08/9-11-timelapse.jpg?w=980&q=75)
See Seven Years of 9/11 Memorial Construction in 90 Seconds [VIDEO]
The National September 11 Memorial will be unveiled on the 10th anniversary of the attacks next month. Workers have been toiling at the site for seven years, but this time-lapse video crunches it all down to just a minute and a half.