The Soviet Union conducted nuclear tests for decades in a barren patch of North Eastern Kazakhstan. The site, called The Polygon, remains radioactive and was subject to a decades-long fight to prevent nuclear weapons material and equipment from falling into the hands of terrorist or rogue states. Alex Pasternack, founding editor of the Vice channel Motherboard, visited The Polygon. His article is Plutonium in the Hills: How Do You Keep Nuclear Secrets Buried Forever.