The famous Huashan Rock Art stretches across more than 160 miles along the Zuojiang River valley in southern China. Now, researchers say that it’s because they were painted with human blood taken from women who’d just given birth. Researchers Discover That The Secret To The Huashan Rock Art’s Preservation Is Human BloodThe more than 80 painted sites known as the Huashan Rock Art have generally been attributed to the ancient Luoyue people. In other words, this rock art did not simply consist of dried paint, but instead a pigmented composite more closely resembling cement. After reading about the Huashan Rock Art, see inside a cave in Turkey that’s filled with more than 100 prehistoric paintings.