From the Qin Dynasty, especially in the Han and Tang Dynasties, the emperor began to build his own mausoleum from the moment he ascended the throne, and it could not be completed until the day of his death. For example, Liu Che, the emperor of the Han Dynasty, built a mausoleum for 53 years. Many exotic animals were buried in it, and' Maoling City' expanded around Maoling. Maoling City is a huge city around Maoling, and its residents are powerful people who migrated from all over the country to show their intention to continue to rule the country after death.
So Ganxian and Maoling are almost the same meaning, but Ganxian stayed and Maoling was abandoned.