Château de Coucy in Coucy-le-Château-Auffrique

You're standing at the ruins of the Château de Coucy, on the tip of a bluff high above the valley. Have a look around. What you see now is mostly rubble, but this was once one of the mightiest castles in Europe. Between two corner towers, right on the side an enemy would attack from, stood the keep. It was over fifty metres tall, the tallest in Europe. Even the four round corner towers were as big as the keeps the French king was building at the time.