About 20 km outside of Xi'an sits the Yangling Mausoleum of the Han Dynasty. Built in 153 AD for Liu Qi and his empress, the tomb covers an area of 20 square kilometers (4,942 acres) and is comprised of the emperor's tomb, empress' tomb, burial pits, a ceremonial site, human sacrifice graveyard and criminals' cemetery. I'm sure your ancestral burial plot also has those last two items.
While you can't enter the actual tomb (boo), you can explore the outer pits at China's first underground museum. The tomb contains around 50,000 doll-sized terracotta figures depicting humans and animals for use in the afterlife. The museums sits on the excavation site and has a glass floor so that you can look down on the ongoing excavations.