For close to a century, the FBI has spearheaded the fight against crime, protecting Americans from threats both foreign and domestic, but the September 11 attacks on the Pentagon and the World Trade Center brought a renewed focus on counter-terrorism for the Bureau. The new National Geographic Special "The FBI," premiering on Wednesday, July 23, at 8 p.m. ET/PT on PBS (check local listings) offers a rare view of the war on terrorism, as it unfolds in real-time.