pingding county
ancient
ancient architecture
building
china
city gate
city wall
famous
former name
fortification
great wall
hawthorn
herein
history
li shimin
mianshan
miles
military
monument
mountain
mountain area
niangziguan
outdoor
pass
peak
pingyanggong
rate
scenic area
shanxi province
sky
stationed
taihang mountains
tang dynasty
tang taizong
the great wall of the great wall
yangquan city
younger sister
yu zeguan