From her home inside the "closed city" of Sarov, Russia — the high-security center for Russian nuclear research — collector Katya Zykova runs an online shop that sells a wide range of vintage Soviet postcards, pins, children's books, and even a large wooden portrait of Vladimir Lenin.

Katya's website, soviet-postcards.com • Katya's Etsy shop • Opening theme: "Keepers" by Still Flyin' • Closing theme: "Slow Draw/Feeling In My Heart" by Eric Frisch • Additional music by Myuu, Biz Baz Studios, Blue Dot Sessions, and Cooper Cannell • www.forkeepspodcast.com