Throughout the centuries, the ancient city wall has experienced and recorded the ups and downs of Xi'an. As the years have passed, the glory of the past has passed away, but only the wall still silently guards the noble majesty of the ancient capital of the dynasty, perfectly blending classical and fashionable charm of the city. This part includes a online live broadcast and a recorded broadcast. International student named Tu Lin, led by Mr. Xu Haining, climbs the ancient city walls, touches the rock-solid bricks that have survived 600 years, recalls the war of the Cold War era, learn about the rituals of the Tang Dynasty and read about the rise and fall of Chang'an history.