The ancient city is immune to the influences of the conventional construction styles of the Central Plains.The roads curve and stretch asymmetrically, with no city walls.

• 北京四合院分前后两院，居中的正房体制最为尊崇，是举行家庭礼仪、接见尊贵宾客的地方，各幢房屋朝向院内,以游廊相连接。