NORTHERN BURGUNDY, France — Deep in a forest of France's Burgundy region, a group of enthusiasts is building a medieval castle the old-fashioned way — that is, with tools and methods from the ...

The stone structure along the San Isabel National Forest known as Bishop Castle started with a 15-year-old, an argument with an English teacher and a heavily wooded plot of land.

But one of the most fawned-over treasures in the castle is Queen Mary’s dollhouse, which was created as a 1:12 scale miniature royal palace. It was built between 1921 and 1924 as a gift from the ...