Which books of your literary tradition, are masterpieces, but are really unknown, from the rest of the world?

I'm Brazilian, in Portuguese language literature, we have so many titles that are classics here in Brazil and Portugal, but no one beside us, seems to know they, some of them are:

The Maias by Eça de Queiroz: This one may be, the greatest classic novel from Portuguese literature, the book tells the family "Maia" story, specifically the point of view of the main character "Carlos da Maia", descendant of a noble family of Lisbon, about the stagnation of Portugal and its culture, how the country was slowly losing it identity to a standardized European way of life, the book have a melancholic, tired and a (wittingly) repetitive tone, Eça style remembers a lot classic writer's like Tolstoy, Balzac and Flaubert, if you like classic literature, this one is definitely a must read. Moreover, this book has a very daring plot twist for the time it was released.

The Devil to Pay in the Backlands by João Guimarães Roda: This one for many of us Brazilians, is considered the "greatest Brazilian Book", unlike The Maias, this book is a cornerstone of the Brazilian Modernism movement, story is told by Riobaldo, an aging jagunço (gunman) in a fragmented, stream-of-consciousness, and cyclical format. He continually questions his own memory and the morality of his actions. At its core, the book deconstructs binary concepts. Riobaldo constantly questions whether the Devil actually exists, whether his pact was real, and blurs the lines between loyalty, love, and brutality.The autor essentially invents his own language. He blends neologisms, archaic expressions, and indigenous terms, maybe the language may be the greatest barrier for this book, to become famous beside the anglophone world, even for Brazilians (including critics and academics), the book is quite a difficult read.

Which great classics of your tradition are in the same situation?