It is common to hear that the mortar used to bind the stones was made from human bones or that men are buried within the Great Wall of China to make it stronger. However, the mortar was actually made from rice flour. No human remains of any kind have ever been found in the Great Wall. Bummer. On the other hand, it’s kind of cool that anti-Qin propaganda worked so well we still think it’s true today, about 2,200 years later.