Introduction to Stone City: Along the winding mountain road to Zhangjiao Village, what you can see is the overlapping layers of the hillside, with the buildings connected end to end, just like an ancient castle. The houses in the village all have one thing in common - they have few and small windows, all for the purpose of preventing theft. In the same house, there must be a narrow open-air lane or small patio between the front and back rooms to facilitate ventilation and lighting.