At different degrees, we are all so familiar with Harry Potter's stories and the wonderful magical adventure that went on to become one of the most successful novel and cinematic franchises of all time. Still, it's hard to believe that it's 20 years since the first film came out, and most of the original fans of the series are now in their 30s and 40s. After the success of reunion specials that have aired recently, like the epic fantasy series Game Of Thrones or the 90s sitcom Friends, HBO has brought us another heartwarming special with Harry Potter 20th Anniversary: Return To Hogwarts, the highly anticipated retrospective special that is now streaming exclusively on HBO GO.