I'm behind the times.
Last fall the book Mapping Mormonism was released, which is an atlas of LDS Church growth since its foundation. These maps present a truly unique way to understand Mormonism past and present. It won awards over chronic winner National Geographic! I have also found for you the BYU Magazine's write-up of the atlas including some of the maps (they're cool!), and the book's website. Check it out!
I would insert one of these awesome images if they were not protected, so use the Magazine link to see a few.