"Man's Search for Meaning" is on my top 10, for sure.

I could not forget the taste of this book that I read as a child in my mind: Heart by Edmondo De Amicis https://en.wikipedia.org/wiki/Heart_(novel)

Daniel

It's a tight competition, just to choose one: I love Children of Time, by Adrian Tchaikowsky. Sentient spider civilizations that use ant hives as computers.