beijing - a panoramic view on an unrenewed gubeikou part of great wall of china. the wall is spreading on tops of mountains

great wall overgrown grass hills nature mist fog smoke pollution smog china watch tower world heritage site stone gubeikou chinese beijing mongolia greatwall simatai outdoors jinshanling dynasty tourism mountain landmark architecture old history ancient hill landscape scenic travel monument culture province ruin mountains scenery asia path sightseeing watchtower outdoor