Classic must-reads that has aged well?

So I’d love to read some classic novels that still feels ”fresh” and doesn’t show it’s age. You know what I mean, it just should not matter if the book is a hundred years old, it has just aged well…
Fantasy books obviously often work well in this regard, but more tech-style books can feel outdated.
Give me some must-reads!
I usually like mystery, sci-fy, supernatural, adventure, fantasy but any classics will do if it’s just ”that” good!