The Fujian Tulou are the most representative and best preserved examples of the tulou of the mountainous regions of south-eastern China. The large, technically sophisticated and dramatic earthen defensive buildings, built between the 13th and 20th centuries, in their highly sensitive setting in fertile mountain valleys, are an extraordinary reflection of a communal response to settlement which has persisted over time. The tulou, and their extensive associated documentary archives, reflect the emergence, innovation, and development of an outstanding art of earthen building over seven centuries. 

http://whc.unesco.org/en/list/1113