badaling
barrier
battlement
border
brick
china
construction
control
crowd
defensive
destination
detail
dynasty
earth
erosion
famous
fortification
fortress
great wall
hill
historical
horizontal
inclined
landmark
landscape
lime
low angle view
ming
monument
no people
nomadic
outdoors
place
popular
rampart
scenic
scrub
silk road
stairs
steep
stone
tourism
tourist
tower
travel
yanqing