The award-winning play Harry Potter and the Cursed Child is about to open at the Curran Theater in San Francisco. The two-part drama takes place 19 years after the events in Harry Potter and the Deathly Hallows and depicts Harry’s life as his son, Albus, is about to begin school at Hogwarts.

J.K. Rowling has pointed out that San Francisco had a deep influence on the original Harry Potter novels, SFGate reports. In the video below, Rowling talks about how Alcatraz, the infamous former prison, inspired her creation of Azkaban.

"[San Francisco] is a very distinctive, special place—I love the feel of it, I love the architecture,” Rowling said. “I've actually said this before, but Azkaban is a combination of Alcatraz and Abbadon, which is an old word for hell. I squeezed those words together. The idea of the rock in the middle of the ocean was directly inspired by a visit to Alcatraz."

With its mist and Gothic mood, it’s no wonder this slice of San Francisco inspired a big part of the Harry Potter world.

[h/t SFGate]