18 bending
bridge
broad
building
building works
canyon
cloud
clouds
conquest
corner
danger
great
hills
holy
holy mountain
human
human activities
human engineering
in yunnan province
lifeline
line
mark rowswell
momentum
mountain roads
mountain view
pattern
plateau
road
route
scenery
stalwart
tibet
traffic
traffic engineering
transformation
transport routes
tunnel
wilderness
winding road