Changed View at Grand Zero

Sept. 11, 2007 — -- Visitors to ground zero on the sixth anniversary of the terror attacks today will find a changed landscape at the former location of the World Trade Center.

Hundreds of thousands of people come to the site each year, but last year they would have seen an empty construction site. Today it's a hive of activity.

"Oh, it feels wonderful. It only took us 5½ years to get there," developer Larry Silverstein told ABC News' Dan Harris.