"It was the best book to come around," said one mother. "There are so many kids reading other books that got started because of Harry Potter."

The first movie, directed by Chris Columbus, was released in 2001.

“It was after 9/11," Watson recalls, "and I remember Chris making this speech that Harry Potter had come about just at the right time when people needed to escape and believe in magic and something greater.”

Themes of love, faith and loyalty have defined Harry Potter and strike a high note in its finale. Speaking of the last curtain, Daniel Radcliffe, the incarnation of Harry Potter for all these years, has a message for his fans.

“Thank you so much for your unrelenting support across the years," Radcliffe says. "I hope you've been satisfied with the films. I think Harry Potter fans have a literary curiosity and imagination. So, I would say, now, take that curiosity out into the world to do extraordinary things with it.”

A message from an extraordinary wizard who taught us to believe everything is possible and to never give up the fight.