'Harry Potter' crew look back on 20 years

Tuesday marks 20 years since the release of the film "Harry Potter and the Philosopher's Stone" ("Sorcerer's Stone" in the United States and some other countries). The story of how its young stars were catapulted to global stardom has often been told. But for a generation of other creative professionals it was also the beginning of a long, fantastical journey, building author J.K. Rowling's magical world.