The tomb complex of the First Emperor, Qin Shi Huang, was found to be much bigger than first thought - at 98sq km, 200 times bigger than Egypt's Valley of the Kings. Two roads out of it were identified through a search with drones.
Experts are particularly excited by the discovery of the DNA that suggests Westerners lived in the area during the time of the emperor, from 259 to 210 BC.
Dr Li Xiuzhen, senior archaeologist at the tomb's museum, said: "We now have evidence that close contact existed between the First Emperor's China and the West before the formal opening of the Silk Road. "This is far earlier than we formerly thought."
This evidence, experts believe, lies in the style of the Terracotta Warriors, as there was "no tradition of building life-sized human statues" found in China before then.
Professor Lukas Nickel, chair of Asian art history at the University of Vienna, believes the tomb was inspired by Greek statues in the era of Alexander the Great, with DNA evidence adding to his theories.
"I imagine that a Greek sculptor may have been at the site to train the locals," he said.
Xiuzhen added: "We now think the Terracotta Army, the acrobats and the bronze sculptures found on site have been inspired by Ancient Greek sculptures and art."
Other findings from the site include the mutilated bones of young women, believed to be high-ranking concubines, buried with jewellery made from pearls and gold.
The skull of a young man, thought to be Prince Fu Su, the emperor's eldest son, was found with a crossbow bolt embedded in it.