Tourists visit the Maiji Mountain Grottoes in Maiji District of Tianshui City, northwest China's Gansu Province on Nov. 2, 2024. The Maiji Mountain Grottoes is one of the four most famous grottoes in China. In the past three years, 29 caves here have been protected and reinforced as Maiji Mountain Grottoes art institute and other cultural relics protection organizations have employed scientific and technological methods to ensure the grottoes remain well-preserved. (Xinhua/Chen Bin)