what was your favourite book ever ?

Mine is to kill a mockingbird. I was "forced" to read this for school when i was 14 (i'm now 62). I was the only kid that enjoyed it, and i will be forever grateful to my english teacher for starting me on a lifetime of reading. I loved that it was written from an 8 y.o girls perspective about racial injustice in the deep south of america,and about her white lawyer father defending a black man for allegedly raping a white woman.

EDIT: thank you to everyone who has responded to my post. So many of you, and so many books for me to check out. Your responces have reinforced my belief that readers are passionate about their books. All hail the written word!