The Qingnanzhuang village of Huanxiu Street of Jimo city has started to clear and protect over 600-year-old stone mill recently. Villagers got materials for stone mill leave these pits. They cover an area of over 7,000sqm; the deepest point is over 20 meters. The pits are one on anther, very stunning. As the evidence of local economic and social development, they will be built into a historic heritage sites. (By Liang Xiaopeng)