To mark the 25th anniversary of the 9/11 terrorist attacks in New York, a non-profit organization launched the "Steel Across America" traveling exhibition, bringing a section of the World Trade Center site to communities across the country. The centerpiece of the 10,500-mile national tour is a 16,900-pound, 21-foot-long steel beam from the South Tower of the World Trade Center. The tour concludes at the World Trade Center site in New York. (Illu…