Even though its name means "in cave" in Chinese, Dongzhong is both a cave and a school. Opened in 1984 in Ziyun County in China's Guizhou Province, this natural, air hangar-sized cave serves as an educational institution for 186 students and their eight teachers. The cave was carved out from wind, water and other natural forces over the course of thousands of years. It now features small buildings, rooms and sport and recreational areas.