We just learned about the Fujian Tulou.
Another type of fortification is an Abatis.
During a battle, sometimes people will chop trees down and lay them on the ground with the branches facing toward the enemy.
They tie them together with ropes or wires so they can't be moved out of the way.
This makes it very hard for the enemy to climb through, and helps keep away the attackers.
(from: wikipedia - abatis)
Kid Facts - Blast from the past: Peleș Castle
