There are many mysterious ancient wonders of the world, from the Giza pyramids to Gobekli Tepe, Sacsayhuman and so on, but whether you believe the archaeological and historical interpretations or an alternative idea, there is always some evidence to draw upon. The same can’t really be said for the subject of this video. The Guyaju Caves is a cave complex found on the slopes of the Tianhuang Mountain in the Yanging District of China and comprises a system of 117 caves, 350 chambers, covering an area of around 24.7 acres or 100,000 square metres.