- ... that publication of one of Adam Mickiewicz's first poems, "Oda do młodości" ("Ode to Youth"; manuscript pictured), was delayed due to censorship?
- ... that much of the success of the Christianization of Moravia, an empire that extended into what is now southern Poland, is attributed to the work of Saints Cyril and Methodius?
- ... that the short story Janko Muzykant ("Johnny the Musician") was one of Henryk Sienkiewicz's works mentioned in a speech during his 1905 Nobel Prize in Literature ceremony?
- ... that archaeological excavations conducted in May 2013 at the Sobibór Museum unearthed an escape tunnel made by Holocaust victims in the Sobibór extermination camp?