Barbarian stronghold

A city surrounding a large wooden fort, with many layers of walls and defenses.  The main Barbarian camp, where the largest ammount of barbarians live. Heavily fortified. Hundres of big tents and smallers houses make up homes, while contraptions made out of wood and rope make drawbridges, lifts and so on. A lot of heavier things are windpowered. There are a lot of big fire pits, banners and animals. Behind the fort are tall mountains.