Coins in the collection of the Xiji County Coin Museum in the Ningxia Hui autonomous region. [Photo by Ma Wenhai/For chinadaily.com.cn]

With more than 30,000 types of ancient coins from different stages of Chinese history, Xiji county in the Ningxia Hui autonomous region is widely accepted in the academic world as the richest trove in the country.

The Xiji County Coin Museum has more than 200,000 coins used from the Xia Dynasty (c. 21st century BC-16th century BC) until today and presents the full story of coins in China.