For years, fans of the beloved "Harry Potter" franchise have flocked to Edinburgh, Scotland, to visit the sites where author J.K. Rowling had reportedly started writing the series.
But now, Rowling has revealed Edinburgh is actually not where the writing of the boy who lived began.
See 35 ways Harry Potter changed the world in a gallery at the end of this story
"I was renting a room in a flat over what was then a sports shop," Rowling said on Twitter, with an image of where she resided at the time of writing the first book. "The first bricks of Hogwarts were laid in a flat in Clapham Junction."
And fans were -- to borrow from the books -- were essentially petrified.
The news came after a fan posted a picture on Twitter of the Elephant House, a coffee shop in Edinburgh which on its website describes itself as the place "made famous as the place of inspiration to writers such as J.K. Rowling, who sat writing much of her early novels in the back room overlooking Edinburgh Castle."
The fan asked Rowling to explain "the truth about this 'birthplace' of Harry Potter."
Rowling, who is known to drop various bombshells and unknown tidbits about the franchise on Twitter, explained that the real "pen to paper" birth of Harry Potter himself, happened in her flat.
However, she said, the moment where she had the idea for the series itself was while she was riding on a train.
"If you define the birthplace of Harry Potter as the moment when I had the initial idea, then it was a Manchester-London train," Rowling tweeted.
"But I'm perennially amused by the idea that Hogwarts was directly inspired by beautiful places I saw or visited, because it's so far from the truth."
As for the high flying, bludger smashing game of Quidditch, Rowling said it was birthed in 1991 after a one-night stay at the the Bourneville Hotel in Manchester.
Rowling went on to dispel some of the other rumors around her inspirations for key icons from the Harry Potter world.
For example, a fan tweeted a picture from the bookstore Livraria Lello, in Porto, Portugal, that supposedly inspired the Hogwarts library. The only trouble is, Rowling said she has never been there.
She did acknowledge that she wrote in a cafe in Rua Santa Catarina, Portugal.
"If it cheers up the people who're disappointed about the bookshop in Oporto, I wrote in here sometimes," she wrote. "This was probably the most beautiful café I ever wrote in, actually."
Rowling also said that rumors around her inspiration for Hogwarts itself miss the mark as well.
"I sometimes hear Hogwarts was based on one or other of Edinburgh's schools, but that's 100% false, too," Rowling said.
"Hogwarts was created long before I clapped eyes on any of them! I did finish Hallows in the Balmoral, though, and I can't lie, I'd rate it a smidge higher than the Bournville."
Out of all the "utter nonsense about Potter landmarks," Rowling said her favorite is people going to a parking meter she supposedly used in Edinburgh while writing the "Deathly Hallows."
"I can't drive," she wrote.
Unfortunately, when it comes to any spoilers about upcoming work, Dumbledore voiced disappointment best: "Alas, earwax."
35 ways Harry Potter changed the world
Platform 9 3/4 actually exists
People follow a religion known as Snapeism
'Muggle' is in the dictionary
There has been a spike in railway trespassing
The young adult genre has seen a significant boom
Quidditch has become a sport
More young people are getting involved in politics
You can take a piece of the Potter world everywhere you go
People take the sorting hat seriously
Even royals have read it
Hogwarts classes are offered online
Costumes are not just for Halloween
Other countries are creating replicas of Platform 9 3/4
It inspired a LEGO installation in Poland
Butterbeer is a thing
J.K. Rowling became an inspiration to single moms
The awe of the films travels across the globe
It inspired a creative pet adoption process in Florida
Scores of pets have been named after 'Harry Potter' characters
The book has been translated into more than 60 languages
More stories have followed the “Harry Potter” series
The movie characters have touched people’s lives
Several Potter-inspired nonprofits have sprung up over the years
Life-changing research is being conducted thanks to J.K. Rowling’s generosity
Fan culture became mainstream
It proved age is nothing but a number
It's an inspiration to sewists
Attractions across the globe are being erected in the name of Harry Potter
Children can see themselves in the stories
Young people have become more accepting
The films launched the careers of several of today’s hottest actors
People are going to Potter Prom
The books proved longer works can work for today’s youth
The stories stay with the readers for life
'Harry Potter' proved a concept can go on forever
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