The Imperial Vault of Heaven (1530; rebuilt 1572) is a smaller circular Building constructed without crossbeams; its dome is supported by complicated span work.

• 皇穹宇(始建于1530年、重建于1572年)是个较小的圆形建筑,完全不用横梁搭建;它的穹顶是由复杂的跨件所支撑。