Anathem

Neal Stephenson's latest, Anathem, is... a very Neal Stephenson book.

By that I mean that it has his hallmarks: very-involved worldbuilding, some mildly quirky characters, and an exuberance in writing that sometimes makes his novels go on a bit longer than they should.

The book is built around a kind of monastery, which only opens its gates to the outer world once every ten years. Within this monastery is another monastery, whose contact with outsiders happens only once a century; and within that it yet another, whose inhabitants only emerge once a millenium.

(Yes, it's very implausible. But part of Stephenson's appeal is that he makes it work; in the context of this parallel-Earth society, it all makes perfect social sense.)

It's stated directly at the beginning that this is not our Earth; but that's easily forgotten, because of the fun that Stephenson has with the evolution of English words. It makes the world feel familiar, somehow. It could be us, far in the future, still dealing with the consequences of things that are happening today.