At noon, we came to Gongbu Jiangda County and met the Gesar Ancient Fort Group, the largest ancient castle group in Tibet, China, passing through the "Xiuba Ancient Fort". This is the most complete ancient castle group in the eastern Tibetan area. It is said that Songzan Ganbu was built more than a thousand years ago. It is very spectacular. It is necessary to praise the huge cost of building such an ancient castle in the rugged mountains. On the 318 line, known as the "China's most beautiful landscape avenue", the legend of the "Gesar Ancient Castle Group" is little known. It is fortunate to enter the ancient castle group (local people also called Xiuba Ancient Castle), through thousands of years of time and space, there are relics related to King Gesar, and they are preserved. More surprising, as soon as I entered this castle group, I remembered that the Gesar castle group has a history of more than 1600 years, and is the oldest, oldest, most densely populated, and most complete structure of the castle group in Tibet. The castle has been through thousands of years of wind and rain, and is still majestic and strong, and it truly shows the exquisite construction craftsmanship of the Tibetan people more than a thousand years ago. A group of modern science and engineering experts, military experts, after watching the majesty of the castle, also marveled at its exquisite craftsmanship, thinking that it was a miracle to complete such a large project under the conditions of the time. The castle group, surrounded by a square, people in it, giving people a suspected entry into the ancient battlefield feeling.