당 고종
The eighteen mausoleums of the Tang Dynasty emperors (唐十八陵) in the valley of the Wei River north of the Qin Mountains (秦岭). Most are natural hills shaped by man, and they are among the biggest Chinese mausoleums, such as Qianling (乾陵), joint tomb of Emperor Gaozong of Tang and of the Empress Wu Zetian. Some mausoleums feature a burial mound: