I just read I Who Have Never Known Men a few days ago and it became an instant favorite for me. I love that it's got a sci-fi/post apocalypse vibe, and I love how it has an eerie, almost hollow sort of feeling to it. I want more books like that! Depress me!
Some other books I've read that I feel are aesthetically similar to what I'm looking for:
The Road by Cormac McCarthy (this is another one of my favorites!)
The Mist by Stephen King (not really looking for more King recs but this one holds a special place in my heart)
Parable of the Sower/Talents by Octavia Butler
by sammi-blue