Originally built during the Eastern Jin Dynasty (317-420) for flood protection from the Lin River, this 6km (4 mile) wall was rebuilt in 1995 by newly prosperous officials. What was little more than a large dyke has been transformed by civic pride into yet another vast propaganda piece, touted as a key defense against Japanese pirates. Allegedly upgraded with "ditai" (watchtowers) and barbicans by General Qi Jiguang who later went on to supervise repairs at the vast counterpart near Beijing, this smaller example is set in wooded parkland that embraces the old city, with numerous points of interest, including a 700-year-old camphor tree and a vast stone altar along its length. Begin with a climb of 198 steps at the Lansheng Gate and allow four or five hours to walk the entire length.