Although incomparable to the Great Caves of China, Cango Caves is the most spectacular and oldest stalactite cave ever discovered in South Africa. When you first enter the cave, you can immediately feel the humidity and small sultry heat. Many people in the same group feel the lack of oxygen, so try to speak quietly in the cave and don't make big moves. In addition, some parts of the ground are slippery, so pay attention to wearing shoes. Pregnant claustrophobic people do not visit.