As a follow up to this one, I'd recommend checking out my coworker, Phil Edwards's great video on the world's tallest mass timber building in Milwaukee, Wisconsin.
In the ninth and 10th centuries, the castles being constructed across Christian Europe were generally wooden structures built on top of artificial mounds that, after the Norman conquest, were called mottes.
" After 20 years in this construction site, we've acquired the expertise and experience to train people and mentor them in order to reproduce that wooden structure" .