An archaeologist works at the No. 3 Horse and Chariot Pit, one of a cluster of tombs belonging to noble families of the Zheng State, a vassal state during the Spring and Autumn (770-476 BC) and Warring States periods (475-221 BC), near the city of Xinzheng in Central China's Henan province, Nov 13, 2017. Since February, four chariots and 122 horse skeletons have been found from the 2,400-year-old pit, the largest of the three within the cluster that have been excavated so far. [Photo/Xinhua]