A steel beam recovered from the rubble of the World Trade Center kicked off its national tour Saturday as part of an emotional commemoration for the heroes who made the “ultimate sacrifice.” The coast-to-coast tour by the Tunnel to Towers Foundation was launched ahead of the 25th anniversary of the 2001 terror attack, in part to help enlighten kids who weren’t alive at the time. The commemoration was dreamed up by Tunnel to Towers Foundation CEO Frank Siller as a way to honor his fallen FDNY brother Stephen, who  raced to the WTC from Red Hook through the Brooklyn-Battery Tunnel  on Sept. 11, 2001. The steel has the “soul” of all the heroes who died in 9/11, Frank Siller said. facebook/Tunnel2Towers “This steel is so significant because it has the soul of my brother in it, and the souls of so many,” said Siller. “It’s important to recognize the heroism that was exhibited on that fateful day. It was nothing short of incredible.…