Archaeologists work 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] 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] Archaeologists work 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] 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]

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 B.C) and Warring States periods (475-221 B.C), is seen 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]

Archaeologists work 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]

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]

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]