Behind the scenes of July Fourth fireworks show to celebrate America 250: The Fourth of July festivities in D.C. will include what's expected to be the largest fireworks show in American history. Pyrotecnico, which has been putting on displays for more than a century, is in charge of the celebration. Rocco Vitale, the company's president, gives a sneak peak at the operation. #FourthofJuly #IndependenceDay #Fireworks #America250 #Celebration