Maoling Mausoleum is the tomb of Emperor Wu of Han, and is located in Xingping, about 40 km west of Xi'an. The tomb is the largest of all tombs built during the Han Dynasty. It is basically a giant pyramid built from rammed/compacted earth. Construction of the tomb began in 139 BC, the second year in the reign of Emperor Wu and took 53 years to complete.. About one third of the court's annual revenue from taxes and tributes was used towards construction of the tomb. Maoling is the largest in a group of more than 20 tombs. The smaller tombs surrounding it belong to former members of Emperor Wu's court, such as Lady Li, the emperor's favorite concubine, and the military strategist Huo Qubing.