Thousands of horses gallop around the Shandan Military Horse Farm, NW China's Gansu province.[Photo by Cheng Lin for chinadaily.com.cn]

In the early winter, thousands of horses gallop around the Shandan Military Horse Farm, which is located in the middle of Hexi Corridor, Northwest China's Gansu province. The farm – one of the oldest and largest horse farms in the world -- covers a total area of about 2,200 square kilometers and can be traced back to the Western Han Dynasty (206 BC-AD 24).