While wandering in Xi'an, you must visit this wonderful archaeological site, which is the border of ancient China walls, which is a wonderful testament to the engineering and construction skills of the ancient Chinese people. The rectangular city wall is 13.75 km long (about 4 hours' walk), while its height 12 meters, and it is considered one of the distinctive sites visited by many locals and tourists from all over the world, where visitors can walk for long hours in the open air or ride bicycles and wander on the paths designated to see amazing and different views of the old and new parts of Xi'an.