On a tangent, take a look at Numenera [0][1]. It's set a billion (!) years in the future, but different from other ultra-science fiction or post-apocalyptic settings in that it primarily explores what Earth would be like after accumulating multiple layers of incomprehensibly advanced supertechnology, the true purpose of which cannot ever be understood by the current inhabitants, and at best they can only reverse-engineer a fraction of the original functionality.
[0] http://www.numenera.com
[1] store.steampowered.com/app/272270/