Nice story about an archaeology buff who is building a castle from scratch in 13th century style. Along with period building material and methods, they are also considering how to defend from period attackers:

Our guide blended humor with the history lesson and had us play the role of invaders to explain how even the smallest architectural details helped protect castles.

Some examples: A staircase turns clockwise, forcing invaders to transfer their spears to the left hand and giving the defense an advantage. An extra-tall step requires them to take off their chain-link armor to scale it. Anyone who actually makes it up the stairs alive would have to bend over to pass through a low doorway — giving the castle’s hatchet-armed defenders a prime crack at their necks.

Sounds like fun, but the real question is what will they do to defend against other period threats like The Black Death. Will these history buffs bathe regularly and keep their lodging clean or find scapegoats to torture and burn?