Published Jul 4, 2017 at 6:14 AM | Updated at 10:24 AM PDT on Jul 7, 2017
What goes on at the Rose Bowl in Pasadena a day before what's billed as the West Coast's largest fireworks show? Take a look.
AmericaFest will light up the night sky over Pasadena, California, Tuesday night, but a lot goes into make sure every boom, bang and pop goes off without a hitch. Workers prepare the fireworks, including complex patterned displays, a day before the show in the images below.