温馨提示：[DVD：标准普清版] [BD：高清无水印] [HD：高清版] [TS：抢先非清晰版]-如影片无法播放或者较为卡顿，请尝试切换播放源。
字节云
剧情介绍
The Hidden Story - Secret History: New evidence rewrites the Great Wall of China's history, decodes its complex signals system and reveals the surprise ingredient that's kept it standing.
……同类型纪录片
