Diaolou (simplified Chinese: 碉楼; traditional Chinese: 碉樓) are fortified multi-storey watchtowers in rural villages, generally made of reinforced concrete. These towers are located mainly in Kaiping, Guangdong province, China. In 2007, UNESCO designated the Kaiping Diaolou and Villages (开平碉楼与村落) a World Heritage Site, which covers four separate Kaiping village areas: Sanmenli (三门里), Zilicun (自力村), Jinjiangli (锦江里), and Majianglong village cluster (马降龙村落群). These areas demonstrate a unique fusion of 19th- and 20th-century Chinese and Western architectural styles.