As summer brings thoughts of vacation, why not consider stopping off on one of the many Parallel Earths of science fiction? There's an infinite number of possibilities available to you - and here are some of our favorites.
Even before most people had heard of Erwin Schrödinger, we knew that there were plenty other Earths out there; we'd seen Star Trek's Mr. Spock with a goatee, or watched the Justice League and Justice Society meet up thanks to a crystal ball. I've already written about my undying love for the concept, and I'm not alone; sci-fi loves to offer glimpses of the roads less taken, whether they're character-based or somewhat more... epic. Consider the following while planning a summer trip to another world: