Zhenbeitai Fortress is located on Hongshan Mountain, 4 km north of Yulin City in Shaanxi Province.

Here's a travel guide to Zhenbeitai Fortress: Overview Zhenbeitai Fortress, situated atop Hongshan Mountain, 4 km north of Yulin City, Shaanxi Province, is one of the grandest structures among the Ming Dynasty Great Wall ruins. It's known as one of the "Three Wonders of the Great Wall of China" (Shanhaiguan Pass in the east, Zhenbeitai Fortress in the middle, and Jiayuguan Fort in the west) and the "First Fortress of the Great Wall." Architectural Features - Layout: Zhenbeitai Fortress is square, with 4 levels, over 30m high. It's built with brick and stone on the outside and rammed earth on the inside. The structure tapers from a large base to a smaller top, with each level receding inwards. Each level is encased in blue brick, and the top outer side has a brick parapet about 2m high, with lookout openings. All levels are interconnected. - Details: The first level is the base, covering an area of 5,056 sq m. The inner wall is 5.5m high, and the outer wall is 10m high. There's a city gate on the south side of the east wall and a brick and stone ramp on the southeast inner side. The second level is 16.6m high, with an arched gateway in the middle of the south wall. Inside, brick and stone steps lead directly to the third level. The horizontal inscription above the arched gateway reads "Xiang Ming" (Towards Brightness). Main Attractions - Kuangong City: Located on the east side of Zhenbeitai Fortress, this was the place where Mongolian and Han officials met, negotiated, and held tribute-paying ceremonies. The city has an irregular rectangular layout, with higher ground in the west and lower ground in the east. It covers a total area of 33,000 sq m. The north wall is shared with the Great Wall, and there are two city gates. - Yima City: Located 800m southwest of Zhenbeitai Fortress, this city was a site for free trade between the Mongolian and Han people, and a historical testament to their peaceful coexistence. Only the earthen walls remain now. It has a quadrilateral layout, with a stone gate on the south side. The perimeter is 1,060m, and the walls are made of rammed earth. There are two gates, one on the south and one on the north. - Yulin Ming Great Wall: Stretching from Shuijingying in the east to Huamachi in the west, with Zhenbeitai Fortress as its center, the Yulin section of the Ming Great Wall extends across one city, two districts, and three counties of Yulin, with a total length of 1,770 *li*. Along the wall, there are numerous structures, including garrison towns, forts, walled villages, and enemy towers. (*Li* is a traditional Chinese unit of length.) Travel Tips - Transportation: You can fly to Yulin Yuyang Airport and then transfer to local transportation. Alternatively, you can take the train to Yulin Railway Station and then take bus routes 10, 15, 20, or 25 directly to Zhenbeitai Fortress. - Tickets: The ticket price is CNY 30. Free admission for seniors over 60. - Opening Hours: 7:30am–7:30pm. - Local Cuisine: Enjoy local specialties such as Hengshan mutton, lamb offal, Xiangshui frozen tofu, and Hengshan mixed noodles.