I am just finishing the "Book of the New Sun" series by Gene Wolfe - as i'm sure you already know, it's a fantastic/preposterous science-fantasy epic set on a post-apocalyptic Earth ("Urth") a million years in the future, when the sun is dying and the world is back in a kind of dark age after eons of scientific advancement and interstellar travel and stuff, and people have reverted to using arcane words like "carnifex" and "thaumaturge" and measuring things in leagues and spans again for some reason. It's a great setting, because among the ruins of earth there's loads of relics of still-functioning ancient advanced technology, so even though people are going around with swords on horseback, there's also teleportation and time travel and laser-guns. It's dense and severe and has lines such as "two creatures with the bodies of men and the heads of cats entered" written entirely seriously/unironically, which is great. There's also a brilliant inversion of the traditional machines-enslaving-humanity idea at one point.
It's pretty fucking difficult to understand what the hell is going on a lot of the time, though. Anyone? There's very blatant elements of Orwell and Lovecraft in there, so i thought dissensus might be a fan.