I'll start with what was, I think, the first novel I read:
Roald Dahl's "The BFG"
He was such an amazing storyteller that his books should be made compulsory reading for primary school pupils from 4th year on. The BFG would make me seek out more of Dahl's work and onto the road of similar imaginative fiction.
“We is in Dream Country,' the BFG said. 'This is where all dreams is beginning!”

What books have made an impact in your life, childhood or otherwise?