Zhangjiata Village in Lyuliang City, north China's Shanxi Province has a history of over 300 years. Nestled in the mountains and built against the slopes, the village features castle-style courtyard houses connected by a 1,700-meter-long underground tunnel system. It allows residents to move through the village without stepping outside. Zhangjiata is celebrated as one of the most well-preserved ancient villages in Shanxi.