World Trade Center memorial plaza scheduled to open in 2011 , closed in 2012 . Memorial at the plane crash site also due to open in 2011 . Pentagon memorial including benches , trees , pools is open daily . `` No more excuses , no more delays . '' Watch 9/11 memorials in New York and Philadelphia on CNN.com daily .
World Trade Center memorial plaza scheduled to open in 2011 , closed in 2012 . Memorial at the plane crash site also due to open in 2011 . Pentagon memorial including benches , trees , pools is open daily . Watch 9/11 memorials in New York and Philadelphia on CNN.com daily .