Some of these worlds were so vicious (Hunger Games, Allison Hewitt is Trapped, Daughter of Smoke and Bone, Icefall, The Girl of Fire and Thorns) that I'd never want to be caught dead in them (*nudges your shoulder* get it? :) ). Others include tragedies in their stories, but they're worlds are just too awesome not to want to visit (e.i. all the other books on this list). Either way, all ten books can thank their authors for being awesome enough to create such impeccable worlds.