A 2,000-year-old skull of a Peruvian warrior housed in The Museum of Osteology in Oklahoma, USA, is thought to be one of the world’s oldest examples of advanced surgery.

Experts believe that the warrior sustained this head wound during battle. When the warrior was brought back from war, Peruvian surgeons implanted a piece of metal in his head to help heal the injury and the warrior survived both his injury and this surgery.

Head injuries were fairly commonplace in Peru thousands of years ago as projectiles like slingshots were used during battles, which caused terrible head injuries.