Because of its relative isolation, a considerable amount of classical architecture remains in the city proper including the original city wall, some of which has been restored. Other cultural relics include the Zhen Bei Tai watchtower, built during the Ming Dynasty, which is the largest troop fortress built on the entire Great Wall, with original and restored pieces of the original Great Wall juxtaposed on both sides. There is a large restoration in process on this area of the Great Wall. In addition, pieces of the ancient Great Wall built during the Qin Dynasty are scattered along the outskirts of town. There is also the Red Stone Gorge, a canyon lined with grottoes containing carved ancient writing and Buddhist art. The town also contains an ancient pagoda. The Chinese dialect of Jin is spoken in Yulin.