Long before the first commercial oil wells appeared in North America, Chinese engineers had already mastered the art of drilling deep into the earth. In the salt-producing region of Zigong in China's Sichuan Province, workers were sinking wells hundreds of meters deep using techniques that would not become common in the West until many centuries later. These remarkable salt wells not only transformed the economy of inland China but also helped inspire the drilling methods that fuelled the 19th-century oil boom in the United States.

A salt drilling field near Zigong, Sichuan, in 1929. Credit: South China Morning Post

A remote village in north-western China, on the edge of the Gobi desert, is said to have been founded by Roman soldiers. According to this controversial theory, the village of Zhelaizhai in China's Gansu Province was established by Roman legionaries who were captured after a disastrous battle, carried across Central Asia, and eventually settled on the far eastern edge of the known world. While most historians remain sceptical of the claim, the story has become one of the most fascinating legends linking the ancient civilizations of Rome and China.

Re-enactment of a Roman legion. Credit: Wikimedia Commons