view of jiayuguan fort with snow capped mountains on the backgrond, gansu, china

ancient architecture army asia asian backgrond building capped china chinese corridor defense desert famous first fort fortified fortress gansu gate gobi guan heaven heritage hexi historic history jia jiayu jiayuguan landmark military monument mountains nature old pass passage post protection road ruins scene scenic silk snow stone taklamakan tourism tourist tower travel under unesco view wall watchtower world