WATFORD, England (AP) — The magical world of Harry Potter is being meticulously reassembled at a former aerodrome near London.

The collection of sheds and sound stages is where the eight films were shot over the course of a decade, and soon they will be home to the official “Making of Harry Potter” studio tour.

With more than five months to go until the tour’s March 31 opening — advance tickets go on sale Thursday — stonemasons in hard hats are busy laying the (real) flagstone floor of the Great Hall at Hogwarts School of Witchcraft and Wizardry. Even half-finished, its Gothic arches, gargoyles and huge fireplace are an impressive sight. When it’s completed, studio Warner Bros. hopes it will be, well, magic.

Movies are all about illusion, but creators of this tour are keen to stress its authenticity. The 150,000-square-foot (14,000-square-meter) site will include only authentic sets, props and costumes, on the original studio site 20 miles (30 kilometers) northwest of London.

For the movies’ cast, who spent a decade working here — the younger ones growing up on set — it can still evoke powerful feelings of nostalgia.

“I get shudders down my spine every time I walk back in there,” said Tom Felton, the 24-year-old actor who played, Draco Malfoy.