There have to be more book combos out there than my suggestion. But I'll start!
  1. Flatland by Edwin A. Abbott and Slaughterhouse Five by Kurt Vonnegut, Jr.
    Blew my mind/expanded my thinking on the multidimensionality of the universe. What also blew my mind is that the A. in "Edwin A. Abbott" ALSO STANDS FOR ABBOTT WTF KIND OF NAME IS THAT, PARENTS OF EDWIN ABBOTT ABBOTT?!
  2. The Anatomy of Violence by Adrian Raine / Blood Meridian by Cormac McCarthy
    After reading the excellent The Anatomy of Violence I felt compelled to re-read Blood Meridian. Powerful stuff about violence, its origin, and its role in society.
    Suggested by @gwcoffey
  3. Station Eleven by Emily St. John Mandel and The Age of Miracles by Karen Thompson Walker
    I read Station Eleven--a multi-stranded post-apocalyptic novel that follows a traveling Shakespearean theatre and orchestral troupe through the upper Midwest--first this summer. When I lent it to my sister-in-law, she recommended Walker's coming-of-age story that's set in a world altered by planetary slowing so that days and nights grow increasingly longer. I read that next, and both books are full of emotionally rich characters that move through intriguing and detailed new realities.
    Suggested by @ladyprofessor
  4. Watership Down and The Passage
    Bunnies and vampires actually have quite a bit in common. 🐰
    Suggested by @alisonkn
  5. The Handmaid's Tale by Margaret Atwood, Spiritual Midwifery by Ina May Gaskin
    Birth is a feminist issue, reproductive rights are human rights.
    Suggested by @avecsarah
  6. 20,000 Leagues Under the Sea / The Mysterious Island (both by Jules Verne)
    Two completely unrelated storylines... OR ARE THEY? Totally blew my mind when I reached the end of 'Island' a few years back.
    Suggested by @andalsothomas
  7. Tell the Wolves I'm Home, by Carol Rifka Brunt (book) / How to Survive a Plague (documentary - Is this cheating? I'm sorry!)
    The book: a beautiful fictional account of a young girl coming to age in the NYC area in the 90s, learning about love and death, family and self, in the most poignant of ways. The movie: an Oscar-nominated film that takes you into the lives of those on the front lines of the NYC AIDS epidemic in the late 80s/early 90s - a grassroots community that fought with such desperation and determination to be seen, heard and saved. Combined: they soar in a way that will make your heart both ache and swell
    Suggested by @Molls2383