Set in the far future after Celestia and Luna mysteriously vanished and the sun and moon froze in the sky, Antipodes is the story of two ponies thrust out into the harsh new world on an adventure to uncover what happened to the world so long ago.
A well-done post-apocalypse far future. A lot of good worldbuilding went into this, and there's a good sense of progression as the story progresses.
The only fly in the metaphorical ointment, IMO, is that a fair number of questions about the fall of equestria are left unanswered. Similar fanfics like Fallout: Equestria generally slip a lot of flashbacks and exposition in about how it all "went down" long ago, and although there was definitely some of that here - you get a good outline - I would have liked to see some blanks filled in. So the ending of the story left me wanting a bit more.