You may be able to recite the Sorting Hat’s song and rattle off different spells, but don’t get into a “Who’s the Bigger Harry Potter Fan?” contest with Alice Finch. The certifiable Potterhead spent 12 months building an incredible 400,000-piece, 170-square-foot Lego replica of Hogwarts Castle that puts your fan fiction to shame.

In addition to its massive size, the most impressive thing about the Lego castle is its depth of detail. Clearly Finch is a smart woman (probably a Ravenclaw) who thought to include a Defense Against the Dark Arts classroom with a closet for a boggart (à la Prisoner of Azkaban), the Chamber of Secrets, and even the Grey Lady. She also helpfully uploaded a 79-photo Flickr album of the whole castle so fellow superfans can properly obsess.

In an interview with Lego blog The Brothers Brick, originally pointed out by Buzzfeed, Finch explained she got inspired by Lego building with her young sons, and that they, along with her husband, helped her finish this massive project. She also discussed how much time went into getting Hogwarts ready for (toy) students. The castle was finally finished in October for the annual Lego festival Brick-Con, where Finch went on to win “People’s Choice” and “Best in Show” last year — not to mention probably about a million honorary house points.

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