Two medieval mummies from a mystery Arctic civilization have been discovered at the edge of Siberia. The remains of an adult and baby were found in the Zelenyy Yar necropolis, an archaeological complex first discovered in 1997, and were covered in copper—with the adult having been plated from head to toe. Excavations at Zelenyy Yar ended last week, and over the course of this year’s expedition to the Arctic site, scientists found 10 graves.