In order to realize his son's sense of achievement by riding around the ancient city wall, and to travel to Xi'an without regret, climb up the city wall to touch the mottled and thick city bricks, and feel more deeply the taste of Xi'an and the history of Xi'an. Shaanxi Museum of History comes out. At 15:30 p.m., we still have two hours to go before the train returns to Beijing. The roadside fruit store quickly bought fruit and went straight to the subway line 2 to kill Yonganmen. Ticket purchases are almost complete (adult 54 + children half-ticket 27), the stomach without lunch is now hungry, while enjoying the beauty of the city while tasting the fragrant durian. After a short stay, I rented two bicycles for the round trip (45 per bicycle per person in two hours, which is too expensive to bear, and OFO will not let them move up). According to the data, Xi'an City Wall is the most complete and largest ancient city wall in China at present. It is about 13.74 kilometers in circumference. It is estimated that the fastest time to ride a week is about 40 minutes with our speed. (Because we can only ride on the watch in a hurry, we suggest that we reserve a half day to step on it slowly and leisurely.) Huh, the city wall is really wide, and the width of more than ten meters is one of my son's. The road was roaring along with bicycles, just as the sunset was setting in the west, facing the light of the west, it seemed as if there was a feeling of trance through time and space, from modern Xi'an to the ancient vicissitudes of the Chang'an City. It seemed that you could see Yang Guifei snuggling in the arms of Tang Xuanzong thousands of years ago, enjoying the beautiful sunset in the West (here is the imagination of literary and artistic young women). My son's shout interrupted my long-distance thoughts, glanced at his cell phone at 16:50, hurried to ask his son to take a photo, rushed down the city wall, and chased back to Beijing train (81 + rental car 90 is so gone, next time I will stay for a whole day, greet the morning glow, send the sunset, cross back to the flourishing Tang Dynasty). This trip is too busy to walk in this ancient capital for thousands of years and appreciate the splendid historical sites and cultures of the ancient capital under the Interlace of the modern prosperous city and the Millennium time. Leave some hope of coming back tomorrow.