International field marathon racing is held at huangyaguan great wall since 1999 it was originally built over 1400 years ago in the northern qi dynasty 557 ad and reinforced with brick walls in the ming dynastyand the wall 557 a d in 1984 major repair work has been performed on over 3 kilometres of the wall including on 20 water towers and 1 water pass it was listed as a site of relics protection in 1986 it was listed as a key relics protection target of tianjin city in 1986 and its