The LEGO Harry Potter Hogwarts Castle and Grounds set is rated 4.6 stars out of five on the Walmart website from 679 reviewers. “This set stands out as one of the finest I’ve ever constructed.

The paper-craft edition is a 1:140 scale model, measuring 21.5 centimeters wide, 21.5 cm deep and 25 cm tall. The ready-to-assemble kit sells for 1,800 yen ($11.50), including tax, and takes about ...