The Ground Zero Scars Hidden In Plain Sight After 25 Years.

A quarter century after the attacks of Sept. 11, 2001, Newsweek's Carlo Versano takes viewers on an exclusive tour around the World Trade Center site in Lower Manhattan with the Port Authority, where covert reminders of what happened that day are everywhere ... if you know where to look. These are the wounds of 9/11 found outside the memorial and museum.