The section of wall presented here, running a mile east-to-west from Dongbian Men to Chongwen Men, was originally built in the Yuan dynasty (1279-1368) and reconstructed in the mid-1500s by the Ming. Modern restoration work on the section began in 2002 and is still in progress, using bricks from the original Ming reconstruction collected from nearby residents (some of whom employed them to build toilets after the wall was demolished in the 1950s). A pleasant park runs east along the length of the wall to the dramatic Dongnan Jiaolou (Southeast Corner Tower; daily 9am-5pm; ¥10), with its dozens of arrow slots; a contemporary art gallery and interesting exhibition on the history of Chongwen can be found inside.