Behind closed doors: Arzamas-16
This town is on the border between the Nizhniy Novgorod region and the Republic of Mordovia. Railway tickets aren't on sale here and it's been excluded from the list of rail stations. In Russian early history, the town was known as Sarov, a holy place for the Orthodoxy with a monastery which bore one of Russia's greatest saints, St. Seraphim. It later became known as Arzamas-16, a secret, scientific centre where the first Russian nuclear bomb was developed. You'll find out the story of its creation and life today in Arzamas-16 in a documentary - Behind Closed Doors: Arzamas-16.