Hands down, HARRY POTTER. From #4 Privet Drive to Hogwarts to Hogsmeade to the Forbidden Forest to the King Cross Station through platform 9 3/4..... Everything about this world is super magical and I can't imagine anyone picking something else. I've read that entire series at least 7 times and I plan to read it many more times over. It's a world I just can't get enough of!
What bookish world did you pick?!
Can you see why I picked mine?