We’ve seen some incredible feats of architecture using Legos so far, but this one might just take the prize.

Via this video from Mashable, Pennsylvania priest Bob Simon has built a Lego replica of the Vatican, as he explains, using only a book jacket cover as his guide.

Simon told USA Today that he had first attempted a Lego Vatican in the seventh grade, which failed, but never let the dream go. This project took about 10 months and half a million Legos. “I was buying bricks [Legos] for about two years before I started,” he said.

Simon also wanted to express diversity with his Vatican, including a “mini figure of the pope waving to a crowd and an array of other figures from nuns with iPhones to robbers, characters with sombreros and Elvis,” according to USA Today.

The structure, which Simon called “an exercise in patience,” is so big that at one point, he realized he could fit inside the main building.

This Lego Vatican is on display at science museum the Franklin Institute in Philadelphia through February.

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