text: This site currently occupies 183 square miles (474 km²); it contains a complex of limestone caves, including the Sterkfontein Caves, where the 2.3-million year-old fossil Australopithecus africanusItebogeng Rankapole, Sandringham High School (nicknamed "Mrs. Ples") was found in 1947 by Dr Robert Broom and John Robinson, as well as the Wonder Cave.