From tattoos to revered ruins - Americans pay tribute

History teacher Ken Senter has a plan to capture the horror of the September 11 terrorist attacks for his students in Tennessee. He’ll take them outside.

Two beams salvaged from the ruins of the World Trade Centre - battered hunks of steel he received after lobbying New York officials for nearly a year - will be shaped into a memorial in front of Oak Ridge High School. Every year, his students will file by for a hands-on history lesson.