Hundreds gather Friday to mark 14 years since the Sept. 11 terrorist attacks, in a ceremony next to a new visitor center intended to keep the stories of heroism alive. Subscribe to WTAE on YouTube now for more: http://bit.ly/1emyOjP Get more Pittsburgh news: http://www.wtae.com/ Like us: / wtae4 Follow us: / wtae Google+: http://plus.google.com/+wtae