panoramic view of the great wall zigzagging through the mountains surrounded of leafy forest. mutianyu section, beijing, china

panoramic view great wall zigzagging mountains surrounded leafy forest mutianyu section beijing china border wonder world pray spiritual protect frontier geography curve sites visit outer cultural path orient buried bodies defend long tomb magnificent way route barrier fortification tower structure defense dynasty boundary war fort military unesco emperor antique hike gate imperial serpentine symbol tradition ruin lookout stairs heritage