It's one thing to create a story and sparsely fill in the immediate world around it — it's quite another to let your imagination run wild and create pseudo-functional maps and diagrams of evil lairs, high-tech hideouts, and state-of-the-art-vehicles. It's those detailed visuals that often show the wonderful imaginations of comic book writers, and thankfully there are a couple of blogs that focus on collecting these playful pieces of art. You can peruse the selections at the (now defunct) Comic Book Cartography and the similarly-named Comic Cartography blogs, and check Kottke for a bit more on the work.