Introduction to Huangzang Cave: In 205 BC, Liu Bang defeated Pengcheng (today's Xuzhou). He led more than 10 defeated soldiers to flee to the southwest mountainous area of ​​​​Xuzhou and came here. They saw the cliff in front blocking the way, and Xiang Yu pursuing him behind. At this situation, Liu Bang looked up to the sky and sighed, "Heaven will destroy me!" Looking around, there was no hiding place. Suddenly, a hole appeared on the cliff. He hurriedly led the remaining soldiers to climb into the hole. Liu Bang secretly thought that I could find this hole. Xiang Yu He is not just an ordinary person, can he find it as well? It would be safer if there was a huge boulder blocking the entrance of the cave. Suddenly a huge boulder fell from the sky and blocked the entrance of the cave. Then many spiders came from nowhere and tied the rest of the entrance of the cave with webs. At this time, Xiang Yu led all the soldiers to come here, and there were four soldiers. He went down to search and found this hole. He reported to Xiang Yu and said: "Your Majesty, there is a hole there, but the spider web is not broken, so no one can enter." Because the cave was blessed by all living beings, Liu Bang escaped this disaster and later established the Han Dynasty.