Arcini searched existing literature to make the first ever catalog of facedown burials from around the world.

She found descriptions of more than 600 bodies from 215 grave sites, from Peru to South Korea.

Dating from 26,000 years ago all the way up to World War I, these so-called prone burials include men, women, and children, though the majority were men. Facedown burials occurred in all sorts of graves, including single graves, double graves, and mass graves.