Introduction to the Human Cave Hall: The Human Cave Hall is 70 meters long, 35 meters wide, and 18 meters high. The main landscapes include reticulated curling stones, Overlord's Whip, Optimus Prime, Hanging Temple, golden cicadas playing with goldfish, etc. There are stalagmites, stone towers, stalactites and stone pillars all over the cave. The largest stone pillar is 8.5 meters high and 4.3 meters in chest, and is called Optimus Prime.