City ruins surrender their fascinating secrets

With an area of about 700 square kilometers, Liyang Plain in Central China's Hunan province on the northwest bank of Dongting Lake boasts more than 700 prehistoric sites.

The most famous are undoubtedly those of Jijiaocheng and Chengtoushan in Lixian county, Changde city, sitting just 13 kilometers apart from each other.

While Jijiaocheng was among China's top 10 new archaeological discoveries of 2021, Chengtoushan was selected twice for the annual list in the 1990s.